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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int n,a=2,sum=2;
  5. 	scanf("%d",&n);
  6. 	do{
  7. 		n=n-1;
  8. 		a=3*a;
  9. 		sum=sum+a;
  10. 	}while(n>1);
  11. 	printf("数列の和は%dです",sum);
  12. 	return 0;
  13. }
  14.  
Success #stdin #stdout 0s 5320KB
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数列の和は80です
https://ideone.com/vHNRqL
language:
C (gcc 8.3)
created:
2 hours ago
visibility:
public

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