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- #include <bits/stdc++.h>
- using namespace std;
- int main(){
- int E = 0, n, i = 1;
- cout << "n= "; cin >> n;
- do{
- E += 2*i - 1;
- i++;
- }while(i <= n);
- cout << "\nE= " << E;
- return 0;
- }
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