Find Sum of Series 1 ^ 2 | Function to find sum of series ; If i is even ; If i is odd ; return the result ; Get n ; Find the sum ; Get n ; Find the sum
function sum_of_series ( n ) { var result = 0 ; for ( i = 1 ; i <= n ; i ++ ) { if ( i % 2 == 0 ) result = result - parseInt ( Math . pow ( i , 2 ) ) ; else result = result + parseInt ( Math . pow ( i , 2 ) ) ; } return result ; } var n = 3 ; document . write ( sum_of_series ( n ) + " " ) ; n = 10 ; document . write ( sum_of_series ( n ) ) ;