Sum of the first N terms of the series 2 , 6 , 12 , 20 , 30. ... | Java program to find sum of first n terms ; Function to calculate the sum ; Driver code ; number of terms to be included in the sum ; find the Sn
import java . util . * ; import java . lang . * ; import java . io . * ; class GFG { static int calculateSum ( int n ) { return n * ( n + 1 ) / 2 + n * ( n + 1 ) * ( 2 * n + 1 ) / 6 ; } public static void main ( String args [ ] ) { int n = 3 ; System . out . print ( " Sum ▁ = ▁ " + calculateSum ( n ) ) ; } }