Input: n = 5, r = 3
n! / r! * (n – r)! = 5! / 3! * (2!) = 120 / 12 = 10
Input: n = 7, r = 2
Approach: The idea is to store the Pascal’s triangle in a matrix then the value of nCr will be the value of the cell at nth row and rth column.
Below is the implementation of the above approach:
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