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