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- #include <stdio.h>
- int main(void)
- {
- int n, i, j;
- float sum = 0, b, f = 1;
- printf("entrez n : ");
- scanf("%d", &n);
- for(i = 0; i <= n; i++)
- {
- for(j = 2; j < i; j++)
- f *= j;
- b = (2*i+1)*f;
- if(i % 2)
- sum -= 1 / b;
- else
- sum += 1 / b;
- }
- printf("%f\n", sum);
- return 0;
- }
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