How smart is Sup Forums?

How smart is Sup Forums?

Other urls found in this thread:

courses.cs.washington.edu/courses/cse312/11wi/slides/04cprob.pdf
twitter.com/NSFWRedditVideo

25%

The euro is a failure anyways

fuck off

50 percent nigger. Also this isn't math, this is reading comprehension.

42.7%

>this isn't math
>gets the math wrong

Ok so since we know that one of them is head, we have the following possibilities:

H-T
H-H

Where the first coin is head

T-H
H-H

Where the second coin is head.

4 cases, 2 of them are both head, 50%

/thread

Retards detected.

The answer is 1/3.

Flip 2 coins, 4 equally likely outcomes:

heads, heads
heads, tails
tails, heads
tails, tails

at least 1 landed heads, so tails,tails no longer a possible outcome, leaves 3

heads, heads
heads, tails
tails, heads

1/3

how is he/she wrong?

Dumbass, you listed 3 equally probable possibilities.

H-H
H-T
T-H

1/3

97% chance that you will get oentardi'd

>lists HH twice

How can you be this retarded?

1/3

i have book about probability with answer, but it's somewhere in the closet, and its very unprobable for me to overcome laziness and get it. But have Taylor Swift anyway.

Because the correct answer is 1/3.

Nigger, one already landed heads, this is isn't rocket science.

he isn't

1 coin is guaranteed to be heads, leaving only one coin to be flipped, meaning only one coin has odds that are relevant to the question.

the coin has 2 sides. 100/2=50

50%

At least 1, you stupid faggot. it could be either coin, giving 3 equally likely scenarios

HH
HT
TH

HH is 1 of those 3

1/3

H-H Come up twice, since it's a possibility both when the first coin is always head as well when the second coin is always head, so you have to count them twice

>1 coin is guaranteed to be heads, leaving only one coin to be flipped, meaning only one coin has odds that are relevant to the question.

No. 2 coins were flipped and either of them could be tails, just not both. So you could have

coin1=heads, coin2=tails
or
coin1=tails, coin2=heads
or
both coins heads

1/3

If your answer to this one is any different than the answer to the one the OP posted, you are retarded.

you stupid autists are so fucking retarded.

one coin is guaranteed to land heads so the only remaining factor is the other coin, 50/50 chance it will land heads

autist deduction

the only possible outcomes remaining are

tails heads
heads heads

because coin 2 is already heads

autist

go kill yourself for being so autistic you fucking downs syndrome faghorn leghorn

>H-H Come up twice

H-H can only come up once, you stupid fuck, like H-T and T-H

>so you have to count them twice
>counting 1 outcome twice

You are so fucking retarded.

1/3

Let me put it like this
one coin is heads
what's the probability that the other one is heads?
1/2

Also, how can you be so offensive, Sup Forums? What if second coin is bi-sided? What if, no mater what side it falls, it still feels like a headtail coin with many tendencies?

HT and TH are the same thing autist

please go drown in the nearest sink

>getting the correct answer is autism now

Damn, son, you're buttfuck retarded.

If the FIRST coin landed heads, the answer would be 1/2

If AT LEAST ONE coin landed heads, the answer is 1/3

Source: Washington University Math Dept. (See Slide 4)
courses.cs.washington.edu/courses/cse312/11wi/slides/04cprob.pdf

No

One coin is guaranteed to be heads so we take that coin out of the equation

if one coin is guaranteed to be heads, what is the probability the the only other coin will flip heads?

100/2=50

this is not hard math

in all 3 of the instances that you listed, each has a heads that is 100% guaranteed because of the initial question. and in each of those 3 instances you listed there is a second coin that is not guaranteed to be heads.

once again 100/2=50

50%

>HT and TH are the same thing autist

This is what retards actually believe

penny=heads, quarter = tails
is NOT the same as
penny=tails, quarter=heads

Kill yourself.

The answer is 1/3

Alright, I'm the nigger. Sorry faggot.

your picture has a differently phrased question

your logic does not pertain to this thread

calling people names does not lead to a productive conversation

There's no "first".

One landed heads, that's it.

What are the odds that both landed heads if you already know that one of them landed heads?

>Autistic answer: 1/3

being this basic. if it had said, ''The left coin lands on head'' then you could take it out of the equation. But since it does not specify wich one you can't. So the one that will land on heads nomatter what, could be the left or right coin.

>so we take that coin out of the equation

No, dumbass. See link

Washington University Math Dept. (See Slide 4)
courses.cs.washington.edu/courses/cse312/11wi/slides/04cprob.pdf

See post here 1/3

You're not getting the probability of a siongle coin landing heads. You're getting the probability that BOTH coins landed heads when at least 1 coin landed heads.

There are 3 ways to get at least 1 heads coin for a 2-coin flip

HH
HT
TH

HH is 1 of thsoe 3 ways

1/3

>Retard answer: 1/2
>Correct answer: 1/3

Disregarding the bad question grammar, the possibilities are:
Bottom-Bottom
Bottom-Head
Head-Bottom
Head-Head

Because 'at least one head' is enough to suffice, the chances are 3 out of 4 possible constellations - or 75%.

Also: Germany ftw

ok pal, see link

For any of the retards who think the answer is 50%, answer Pic related

source: autism university

nothing will cure your autism

please drink a sufficient amount of bleach to kill yourself

drink whatever bleach abovefag has left, autist

the types of coins do not matter

if one coin is guaranteed heads, there are only two possible outcomes which you fail to understand, switching the order of the coins around does not mean new outcome, it just means you're an autist

your mother clearly dropped you on your head as a child, please instruct her to finish the job

3 out of 4 have at least 1 heads
1 out of those 3 has both heads

1/3

once again, that is a differently phrased situation

...

>gets a basic conditional probability question wrong
>HURR DURR autist HURR

I'll take a large fries with that, thanks.

1/3

Captain over-complication over here

If a coin is guaranteed to land heads then it's as if someone has just placed it heads up on the table

Then all there is to do is flip one coin which has a 50% probability of landing heads

Christ.

>if one coin is guaranteed heads

Which coin, faggot?

mathematically it's 1/3, although there is no fucking way that's right, and in the end it' 1/2 as the they are independent events

Yeah. Same question reworded. Same answer.

1/3

It doesn't matter you autistic retard

kys tard

No, it is not.

Read the first goddamn post,

Atleast one coin WILL be heads, every single time. The other coin may be heads, may be tails. 50% outcome.

it doesn't matter, autist

if one coin MUST be heads,

the other coin can only be heads or tails

this is only hard to understand if you're a faggot that believes HT is different from TH when it's the same combination of coins in a different arrangement, an irrelevant bit of data

fucking

autism

everywhere

in this fucking thread

it doesn't matter which coin is heads as long as one of them is guaranteed to be heads.

that leaves one coin that is relevant to the question. doesn't matter which because the other is heads.

50%

/thread

Saying tails-tails isn't the result isn't the same as saying that one landed heads, you fucking idiot.

The problem CLEARLY states that ONE LANDED HEADS. If you know one landed heads, what are the odds that both landed heads?

Again, remember ONE landed heads, how about the other? You only have to worry about one coin here, not two. You already know one of the outcomes.

>If a coin is guaranteed to land heads then it's as if someone has just placed it heads up on the table

No, you retard.

2 coins were flipped, and at least 1 landed heads. it landed heads by chance. it could be EITHER coin, meaning EITHER coin could be tails, just not both.

Do you understand the difference between placing a specific coin as heads on the table and flipping a coin which COULD land tails?

In your scenario, a specific coin is FIXED as heads, and teh answer would be 1/2/

In OP scenario, NO coin is FIXED. Either coin could still be tails. This leaves 3 equally probable outcomes which all contain
>At least 1 heads coin

HH
HT
TH

All 3 of those are still possible. All 3 are equally likely.

1/3

its 1/3 you tard if youre so retarded you dont understand it then do it yourself tard, flip 2 coins 300 times tard and count it out tard

i like you

50% is truth

it's the same you tard, either way is just saying there aren't 2 tails/there's at least 1 heads, tard

>HT
>TH
u wot m8

For all you tards that cant understand this coz youre a tard, flip 2 coins 300 times (or write a program to do it for you), ignore the times they both land tails, and count the rest, it will be 1/3 having both heads

Yes, it does matter, you stupid cunts.

Take a penny and a quarter.

Each coin has a 50% chance of landing either heads or tails. You flip both coins. What are the possible outcomes? Well, let's see:

penny = heads & quarter = heads
penny = heads & quarter = tails
penny = tails & quarter = heads
penny = tails & quarter = tails

4 possible outcomes. Each of them equally likely to occur (25% or 1/4)

Now, surely we can all see how the results,
penny = heads & quarter = tails
and
penny = tails & quarter = heads
are different, right? Surely you can see how these are two distinct, separate and equally probable outcomes, yes?

Great, let's continue. Now, it DOES NOT MATTER if you are using two identical coins. HT & TH are two distinct results, and the probability of at least one of them occuring is TWICE the probability of a HH or TT outcome. Remember HT(1/4) + TH(1/4) = 1/2.

So, since we know that TT can't be the result in the OP question, it is discarded, and we are left with the possible outcomes:

HH (1/4)
HT (1/4)
TH (1/4)

Three equally probable outcomes containing at least one heads, hence the answer = 1/3

ITT: Retards who are unfamiliar with conditional probability

This is similar to Monty - Holl problem and the answer is 1/3

>Saying tails-tails isn't the result isn't the same as saying that one landed heads

At least one.

Answer the question, tard.

Protip: It's' 1/3

>2 coins were flipped, and 1 landed heads.
>NO coin is FIXED
>This leaves 3 equally probable outcomes
>3 outcomes
>3
>2 coins
>1 heads
>3 outcomes

>mathematically it's 1/3, although there is no fucking way that's right

Are you fucking retarded?

>Math says 2+2 = 4
>there's no way that's right

Kill yourself.

1/3

>Atleast one coin WILL be heads

Could be either coin

heads, tails
or
tails, heads
or
both heads

1/3

You're pretty dumb I take it?

You just argued against my agreement with my agreement.

yeh clicked on the wrong tard, whatever

There are 2 "girls" standing in front of you.

At least 1 is a trap.

Do you still think it doesn't matter which?

1/3

If this was the OP I would as a stretch say 0 because the answer would be in the question that only one landed heads instead of saying so far only one landed heads

Simulation confirms 1/3

Three possible outcomes
Heads - Tails
Tails - Heads
Heads - Heads
1/3

I really hope you don't have to work with numbers when you're a grown up.

49%
Heads part is always heavier, thus it's more likely to land on tails

0 is correct for this question.

1/3 is correct for OP question

>thinks HT and TH are the same

kek

>2 girls
>1 is a trap
>1 in 3 chances of it being a trap
>1 in 3
>2 girls

You're digging yourself into a hole here, pal.

It's 50/50 lmao, cmon guys

At least 1 is a trap.

>thinks 3+1 is different than 1+3

I think a lot of the confusion here come from the two different ways the question can be interpreted. Does at least one coin always land on heads? Because if that's the case, just picture flipping a coin while you have the other already on the floor facing heads.

your understanding of this seems to assume that it matters which coin is which when the OP's image never mentioned such

the only thing that matters is heads or tails, the types of coins make no difference

if one coin is always H, you can have either

HH
or HT

TH is the same as HT because one coin is heads, the other is tails, their order is irrelevant

it doesn't matter if one's a penny and one's a quarter because the question isn't "flip a penny and a quarter, ..." it's "flip two regular coins, ..." and the question posed is "what's the probability they will both land heads given that one will land heads?" not "what is the probability that they will both land heads given that either the quarter or the penny will land on heads?" which is the question you keep answering instead of the one actually asked

no matter how you arrange the coins, one is always heads, so the other can only be heads or tails, it's 50/50

i've never seen autism so powerful

i'd say 33% if you assume 1% chance of edge

They aren't equal
The outcome is
1+3=x
3+1=y
x=y
1+3=/=3+1

This is a conditional probability question, so use Bayes' theorem to solve.
P(A|B) = P(A∩B)/(P(B))

Explanation for faggots:

COnditional probability questions take the form:
>What is the probability of Event A given Event B?

OPs question is
>What is the probability that BOTH coins landed heads, given that AT LEAST ONE coin landed heads?

So here

A = "both coins are heads" = {(HH)} = 1/4
B = "at least one coin is heads" = {(HH), (HT), (TH)} = 3/4

P(A|B) = P(A∩B)/(P(B)) = (1/4)/(3/4) = 1/3

im too high to try to figure this out

This isn't addition, pleb, this is probability of events.

HT is a different event to TH.

im too high to solve this

im too high to calculate this

>3+1 isn't equals to 1+3
>being serious about it
>calling others stupid and bad at math
>because 3+1 ≠ 1+3
>mfw 4 ≠ 4
Is this what common core teaches you kids these days?

thanks based fam

But either way, there is one head and one tail... so it's one probability. 50/50 bitch

>if one coin is always H

OP question never states this, you fucking retard.

>2 coins were flipped. At least one landed heads.

1/3

>TH is the same as HT

Never have kids.

Knowing the correct answer to a basic conditional probability question isn't a sign of autism, you simpleton.

The answer is 1/3. Explanations and solutions already given in this thread include:

>Bayes' theorem
>Punnett squares
>simulation
>Probability trees
>graphical illustrations
>written explanations

Clearly that's not enough for the retards to understand.

Here, have a Venn Diagram

1/3

Btw, your overzealous use of "tard" screams you're a child

Geting 1 head and 1 tail is TWICE as likely as getting 2 heads, simpleton.

HH = 1/3
HT/TH = 2/3

1/3

im so high im just sittin here fapping to maths

1/3 you fucking retards. Take a goddamned statistics class.

Fucking retard
I'm saying the outcome is same the only difference is the course of action
>it isn't same when you press gas three times and then turn on the car
And when you turn on the car and press gas three times
>the car still won't move until you press the clutch and put the car in first speed
>the outcome will be same but it's not a same course of action

haha

attempt confirmed

fail regardless