An example of a recursive programing using C++

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Implement a recursive function PI(n) that calculates pi with n terms, as per the series given below. Write 2 versions: (a) without accumulator and (b) with accumulator. pi = 3 + 4/2 times 3 times 4 times - 4/4 times 5 times 6 times + 4/6 times 7 times 8 times - 4/8 times 9 times 10 times + .. Implement a recursive function PI(n) that calculates pi with n terms, as per the series given below. Write 2 versions: (a) without accumulator and (b) with accumulator. pi = 3 + 4/2 times 3 times 4 times - 4/4 times 5 times 6 times + 4/6 times 7 times 8 times - 4/8 times 9 times 10 times +