Program to find Sum of the series 1 * 3 + 3 * 5 + ... . | Javascript 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
function calculateSum ( n ) { return ( n * ( 4 * n * n + 6 * n - 1 ) / 3 ) ; } let n = 4 ; document . write ( " " + calculateSum ( n ) ) ;