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expected number of trials to get n consecutive heads

#include "bits/stdc++.h"
using namespace std;
  
// Driver Code
int main()
{
    int N = 3;
  
    // Formula for number of trails for
    // N consecutive heads
    cout << pow(2, N + 1) - 2;
    return 0;
}

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expected number of trials to get n consecutive heads

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