Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

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## #1 Re: Guestbook » I play here from my school » 2008-02-26 13:49:02

Claudia wrote:

im in 6th grade and i have computer class we usually come here when we finish our work and we come here to play ( everyone in the class is seeing me type this ) our favorite games our the warthog, hangman, and tictactoe.

love
Claudia ( person typing this, AKA miss popular):D
Lourdes
Elison
Anthony
Raul
David
Armando
Daniel
Daniela
Ashley
Erika
Melissa
Joselyn
Brian :D

this sight is for math!! so dont show ur snobby friends(justkidden

## #2 Re: Guestbook » I play here from my school » 2008-02-26 13:34:23

who wants ta be me friend

## #3 Re: Jokes » Great Truths that Adults Have Learned » 2008-02-26 13:33:29

what do you call a chiken with legs? a chiken leg. hahahahahahahahqha

## #4 Re: Help Me ! » Combinatorial Proof » 2008-02-26 13:30:44

clooneyisagenius wrote:

I need a cominatorial proof of:
((n choose 2) choose 2) = 3(n choose 4) + 3(n choose 3)

for example, (n choose k) means from a total of n people we choose a committe of size k.
(though this may not be relevant equation)

I'm thinking for the left hand side that out of a total of n people we find the all the possible committees of size 2. Then of all these committees we pick two of the duos picked? No idea how to do the right hand side - or make the left side equal

weel i need help from u. how do yo do common denominators, also explain urs better:o