Question: 4. (2 pts) Let b1, ...,be be positive integers with sum less than n. Prove combinatorially that b1!. .. bk!

4. (2 pts) Let b1, ...,be be positive integers with sum

less than n. Prove combinatorially that b1!. .. bk!

4. (2 pts) Let b1, ...,be be positive integers with sum less than n. Prove combinatorially that b1!. .. bk!

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