Your task is to complete a function “count_heads()” that takes two inputs N and R. The function should return the probability of getting exactly R heads on N successive tosses of a fair coin. A fair coin has equal probability of landing a head or a tail (i. e. 0.5) on each toss.

Function “count_heads()” that takes two inputs N and R. the function should return the probability of getting exactly R heads on N successive tosses of a fair coin. A fair coin has equal probability of loading a head or a tail( i.e 0.5) on each toss​

Explanation

Probability of getting K heads in N coin tosses

 

Given two integers N and R. The task is to calculate the probability of getting exactly r heads in n successive tosses.

 

A fair coin has an equal probability of landing a head or a tail on each toss.

 

Examples:

 

Input : N = 1, R = 1

Output : 0.500000

 

Input : N = 4, R = 3

Output : 0.250000

 

Answers

  • Answer posted by: arpita kundu

    i got free points from you guys

    Explanation:

    thanks

    Thanks (1)
    Useless
  • Answer posted by: deepak yadav

    Given two integers N and R. The task is to calculate the probability of getting exactly r heads in n successive tosses.

    A fair coin has an equal probability of landing a head or a tail on each toss.

    include <bits/stdc++.h>

    using namespace std;

     

    // function to calculate factorial

    int fact(int n)

    {

    int res = 1;

    for (int i = 2; i <= n; i++)

    res = res * i;

    return res;

    }

     

    // apply the formula

    double count_heads(int n, int r)

    {

    double output;

    output = fact(n) / (fact(r) * fact(n – r));

    output = output / (pow(2, n));

    return output;

    }

     

    // Driver function

    int main()

    {

    int n = 4, r = 3;

     

    // call count_heads with n and r

    cout << count_heads(n, r);

    return 0;

    }

    Output:

    0.250000

    hope it help u

    Thanks
    Useless
  • Answer posted by: vansh singh

    Probability of getting K heads in N coin tosses

    Given two integers N and R. The task is to calculate the probability of getting exactly r heads in n successive tosses.

    A fair coin has an equal probability of landing a head or a tail on each toss.

    Examples:

    Input : N = 1, R = 1

    Output : 0.500000

    Input : N = 4, R = 3

    Output : 0.250000

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