4. PI Approximater The value of can be expressed by the following infinite series =4(1--+ 3+57+5 11 + +13-... An approximation can be made by taking the first n terms of the series. For n 4, the approximation is 33 2.8952 Write a program that promotes user for the value of n and outputs an approximation of according to the series above. n should be an integer greater than 0. Enter the values of n 4 The approximation of Pi is 2.8952