recursive algorithm to determine C(n,r).

Computer Science
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Question description

Suppose C(n,r) denotes the number of ways r different things can be chosen from a set of n items.  Then C(n,r) is given by the following formula:                                                                         

where the exclamation point denotes the factorial function.  Moreover,   It is known that  

  1. Write a recursive algorithm to determine C(n,r).  Identify the base case(s) and the general case(s).

  2. Using your recursive algorithm, determine C(5,3) and C(9,4).

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(Top Tutor) Daniel C.
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