Find Sum of Series 1 ^ 2 | Function to find sum of series ; If n is even ; If n is odd ; return the result ; Get n ; Find the sum ; Get n ; Find the sum
function sum_of_series ( n ) { let result = 0 ; if ( n % 2 == 0 ) { result = - ( n * ( n + 1 ) ) / 2 ; } else { result = ( n * ( n + 1 ) ) / 2 ; } return result ; } let n = 3 ; document . write ( sum_of_series ( n ) + " " ) ; n = 10 ; document . write ( sum_of_series ( n ) ) ;