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- #include<stdio.h>
- int main()
- {
- int i;
- double sum=0,j=1.0;
- for(i=1;i<=39;i+=2)
- {
- sum=sum+(i/j);
- j=(j*2);
- }
- printf("%.2lf\n",sum);
- return 0;
- }
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