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- #include <iostream>
- #include <cmath>
- using namespace std;
- int main()
- {
- int n;
- double a,An=1;
- double Sum=1;
- cin>>a>>n;
- for(int i=1;i<=(n+1);i++)
- {
- An*=a;
- }
- Sum=(An-1)/(a-1);
- cout<<Sum;
- return 0;
- }
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