computePI(int n) – One remarkably simple formula for approximating the value of pi is the so-called Madhava–Leibniz series: pi/4 = 1 − 1/3+1/5 −1/7 +1/9 − ⋯ +/− 1/2n-1. Note that the result of the...

computePI(int n) – One remarkably simple formula for approximating the value of pi is the so-called Madhava–Leibniz series: pi/4 =  1 − 1/3+1/5 −1/7 +1/9 − ⋯ +/− 1/2n-1. Note that the result of the series is a quarter of pi. The accuracy of the approximation is dependent on the value of n. This method takes an int parameter n and calculates the value of pi, rather than pi/4. Pay attention to the sign (positive or negative) of each term.

public double computePI(int n)
    {
        // TODO: implement this method


    return -1; //replace this statement with your own return;

}