Find n _ k 1 + n _ k and write the answer as a binomial coefficient in the form n _ k
Chapter 9, Problem 48(choose chapter or problem)
Find n _ k 1 + n _ k and write the answer as a binomial coefficient in the form n _ k . Prove it. Hint: Use the fact that, for any integer p, such that p 1, p! = p(p 1)!.
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