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#include<bits/stdc++.h> using namespace std; int recur(int n, int r) { if (r == 0 || r == n) return 1; else return recur(n - 1, r - 1) + recur(n - 1, r); } int main() { int n, r; cin >> n >> r; int ncr = recur(n, r); cout << ncr << endl; return 0; }
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