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- #include <stdio.h>
- int main(void){
- int n, a, a1, an, aAnterior, razao, i, somatoria;
- printf("Digite a sequencia: ");
- scanf("%d", &n);
- for(i = 0; i < n; i++){
- scanf("%d", &a);
- if(i == 0){
- aAnterior = a;
- a1 = a;
- }else{
- if(i == n){
- an = a;
- }
- if(i == 2){
- razao = a - aAnterior;
- }
- if(a - aAnterior != razao){
- printf("Nao eh uma pa\n");
- return 0;
- }
- }
- }
- somatoria = ((a+an)*n)/2;
- printf("r = %d\nn termos = %d\nSomatoria = %d", razao, n, somatoria);
- return 0;
- }
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