Program to find Sum of the series 1 * 3 + 3 * 5 + ... . | PHP program to find sum of first n terms ; Sn = n * ( 4 * n * n + 6 * n - 1 ) / 3 ; number of terms to be included in the sum ; find the Sn
< ? php function calculateSum ( $ n ) { return ( $ n * ( 4 * $ n * $ n + 6 * $ n - 1 ) / 3 ) ; } $ n = 4 ; echo " Sum = " ? >