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- #include <stdio.h>
- int sumapares (int n)
- {
- if(n>=2)
- {
- return n + sumapares(n-2);
- }
- }
- int main()
- {
- int num,suma;
- scanf("%d",&num);
- if ( num % 2 == 0){
- suma= sumapares(num);
- printf("%d",suma);
- }
- else
- printf("ERROR ");
- return 0;
- }
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