How can I prove that the binomial function is a probability function?

I attached the solution I got from my slides...but I dont understand the 2nd part!

Thanks for your help!

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- December 28th 2011, 12:42 PMMarmyProof that binomial function is a probability function?
How can I prove that the binomial function is a probability function?

I attached the solution I got from my slides...but I dont understand the 2nd part!

Thanks for your help! - December 28th 2011, 01:06 PMPlatoRe: Proof that binomial function is a probability function?
- December 28th 2011, 02:26 PMMarmyRe: Proof that binomial function is a probability function?
Thanks!