Answer Posted / ankur mohan sharma

#include<stdio.h>
#include<conio.h>
int main()
{
int i,n;
for(n=2;n<=20;n++)
{
for(i=2;i<n;i++)
{if(n%i==0)
break;}
}
if(i==n)
printf("\n %d",n);
return 0;

}

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