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- #include <math.h>
- int binom(int n, int k)
- {
- if (k == 0 || k == n)
- return 1;
- return binom(n-1, k-1) + binom(n-1, k);
- }
- double calc(int M);
- {
- int n, k, M, num;
- while (n < M) {
- num = pow(3, n);
- n++;
- }
- return num / binom(n, k);
- }
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