Question: Hello, I am having problems with this question. Give a combinatorial proof for the identity, where n m: Sum(i=0,m) = (n i choose m i)(k

Hello,

I am having problems with this question.

Give a combinatorial proof for the identity, where n m:

Sum(i=0,m) = (n i choose m i)(k + i choose i) = (n + k + 1 choose m)

That is, describe a set of objects such that both sides count the number of elements in it.

Thank you

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