Following are common definition of Binomial Coefficients.
- A binomial coefficient C(n, k) can be defined as the coefficient of X^k in the expansion of (1 + X)^n.
- A binomial coefficient C(n, k) also gives the number of ways, disregarding order, that k objects can be chosen from among n objects; more formally, the number of k-element subsets (or k-combinations) of an n-element set.
Given two numbers n and r, find value of nCr
Input : n = 5, r = 2 Output : 30 The value of 5C2 is 10 Input : n = 3, r = 1 Output : 3
The idea is simply based on below formula.
nCr = (n!) / (r! * (n-r)!)
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