Let n be a nonnegative integer. Use the identity

To show that

.

So far ive gotten to...

Using the binomial theorem;

and setting x and y to one we get;

so...

but from here i dont know what to do... Any help please?

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- Feb 18th 2008, 03:48 AMDeadstarSumming proof
Let n be a nonnegative integer. Use the identity

To show that

.

So far ive gotten to...

Using the binomial theorem;

and setting x and y to one we get;

so...

but from here i dont know what to do... Any help please? - Feb 18th 2008, 04:08 AMtopsquark
- Feb 18th 2008, 04:20 AMDeadstar
ok well how about

where to now? - Feb 18th 2008, 04:24 AMtopsquark
- Feb 18th 2008, 04:29 AMPlato
Using Dan’s hint: let x=1.

Then and we know that .

Can you finish?