Question: Please answer this question. 13. (a) Evaluate the sum 1+2 + ... (k + 1)( n k + ... + (n+1) by breaking this sum

Please answer this question.

Please answer this question. 13. (a) Evaluate the sum 1+2 + ...

13. (a) Evaluate the sum 1+2 + ... (k + 1)( n k + ... + (n+1) by breaking this sum into two sums, each of which is an identity in this

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