6lab(183)

#include <iostream>
using namespace std;
 
int main() {
    long a, b, n, S;
    cin>>a>>b;
    n=b-a+1;
    S=(a+b)*n/2;
    cout<<S<<endl;
    cout<<"Геометрическая прогрессия";
    return 0;
}

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6lab(183)

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