C
c
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//Combination exercise,please help me for deal it 😊😊😊
#include <stdio.h>
#include <math.h>
int main() {
long n,i,p=1;
scanf("%ld",&n);
for(i=1;i<=n;i++)
{
p*=(n-i+1)/i;
}
printf("p=%ld",p);
return 0;
}
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