VILL- DEBANDI, AMTA, HOWRAH PIN-711410 Phone-9836357266
20. a-a²+a³-a⁴... :—
#include<stdio.h>
int main()
{
int i,n,a,s,sum;
printf("enter value of n and a ");
scanf("%d%d",&n,&a);
sum=0,s=-1;
for(i=1;i<=n;i++)
s=s*-1;
sum=sum+pow(a,i)*s;
}
printf("%d",sum);
return 0;
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