#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int main(){
float S=2,b=1;
int i,j;
for(i=2;i<10;i++){
for(j=i;j>=2;j--){
b=b*j;
}
S=(float)S+(float)1/b;
b=1;
}
return 0;
}
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