How many balls are there Sup Forums?

How many balls are there Sup Forums?

enough to fill up ur mum

over 9000

atleast 7

9^2!

This is now a get thread.

Check em.

(sqrt(3)/4 * 9^2)+(sqrt(3)/4 * 8^2)+...

Not enough for op

285

81
/thread

8

Only 2 in my sac. But I know a guy with 3

Poor misled little thing, you can't /thread your own post.

165

Some decent balls in there, for their eras

204

165 pleb. it's fucking 284 you all suck summer fags

yep

163

285

Math?
For 165
9+8+7+6+5+4+3+2+1
8+7+6+5+4+3+2+1
7+6+5+4+3+2+1
Etc until you have your answer

420

165 OP

i don't care

How I got it:
9x9 + 8x8 + 7x7 + 6x6 + 5x5 + 4x4 + 3x3 + 2x2 + 1x1 = 285

>the inside of the tetrahedron is actually empty and all you fags got it wrong

the answer is always 42

Wrong
Base is a triangle not a square faggot

But it's a triangle

Winrar

This

No it's a squire, u imbosile.

There are 109 balls in that pyramid
1 on top
1×3 = 3
2×3 = 6
3×3 = 9
4×3 = 12
5×3 = 15
6×3 = 18
7×3 = 21
8×3 = 24

Except it's a square not a triangle.

NO ITS A SQUIRE U FUCKING IMBOSILE MY GOD HOW FUCKING OLD ARE YOU KID? PASS GRADE 3 BEFORE YOU FUCKING INSULT PEOPLES INTELLIGENSE YOU FUCKING KIDDO

Bunch of summerfags in here, the only answer is 165

RIP english

bout tree fiddy

the factorial method makes sense

FUCK YOU

The retardation is emanating off this post

284?

Ur d only retard here fag

1+(1+2)+(1+2+3)+(1+2+3+4)+(1+2+3+4+5)+(1+2+3+4+5)+(1+2+3+4+5+6)+(1+2+3+4+5+6+7)+(1+2+3+4+5+6+7+8)+(1+2+3+4+5+6+7+8+9)=165 faggots

165

If the height of the pyramid is N

The total number of balls is

SUM (from J=0 to J=N-1)
of
(J+1)*(N-J)

Since the height of this pyramid is 9 you get 165.

>tetrahedron
It's a fucking triangle

the only real answer

They teach this to 8 year olds.

Fuckwads. Its 285

Looks like he did. Just like I'm about to.

You faggot
/thread

tetrahedron means 4 sides.

a pyramid with a triangle base is a tetrahedron.

look up "4-sided dice"

>tetrahedron
look at this faggot
stupid summerfag

109 if its hollow

the sequence of growing triangles as you add on a new row is
1, 1+2, 1+2+3, 1+2+3+4, etc

so with the tetrahedron of 9 stacks, we have
9x1+8x2+7x3+6x4+5x5+4x6+3x7+2x8+1x9 =
165

Correct.

To lazy to count it out, but I'd assume you could start at the bottom,
>9+8+7+6+5+4+3+2+1
Next layer
>8+7+6+5+4+3+2+1
So on and so forth?

this

American education system everybody.

seamfag

yes

911