Question: plese help me solve 8. Consider the binomial identity (?)+2(:)+3(:)+~-+n(:)=n21- a. Give a combinatorial proof of this identity. Hint: What if some number ofa group

plese help me solve

8. Consider the binomial identity (?)+2(:)+3(:)+~-+n(:)=n2\"1- a. Give a combinatorial proof of this identity. Hint: What if some number ofa group of n people wanted to go to an escape room, and among those going, one needed to be the team captain? b. Give an alternate proof by multiplying out (1 + a3)\" and taking derivatives of both sides. For the combinatorial proof: what if you don't yet know how many bridesmaids you will have

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