need help with math simplification

s3b4k · #1 03-12-2010, 12:38 AM

can someone please simplify this if it equals the RHS, the RHS is in a combination so you need to actually plug it in the combination formula

http://img93.imageshack.us/i/combinationsproof.jpg/

someonesdad · #2 03-12-2010, 02:41 PM

Doesn't look like an equality to me -- plug in n = 1 and k = 0 (if you don't like those numbers, try n = 2 and k = 1).

t_n_k · #3 03-12-2010, 08:46 PM

$\frac{(n-k)![(n-k+1)(n-k+2)-k(n-k+1)+k^2]}{k!(n-2k+2)!}$

is the closest I can come. Haven't checked it carefully.

t_n_k · #4 03-13-2010, 06:23 AM

Nope that didn't work either ...

Maybe ...

$\frac{(n-k)![(n-k+1)(n-k+2)-k(n-2k+1)-k^2]}{k!(n-2k+2)!}$

What's the point of the problem anyway?

s3b4k · #5 03-14-2010, 12:17 AM

because i needed to proove this identity and it was not equaling for me, just wanted to see if it would work for anyone else to see if I was making a math error

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The Following User Says Thank You to someonesdad For This Useful Post:
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