To store the sum and sum of squares of the array elements
let sum = 0 ; let sumSq = 0 ; for ( let i = 0 ; i < n ; i ++ ) { sum += arr [ i ] ; sumSq += Math . pow ( arr [ i ] , 2 ) ; } B = ( ( ( sumSq - sumSqN ) / ( sum - sumN ) ) + sumN - sum ) / 2 ; A = sum - sumN + B ; document . write ( " " + A , " " , B ) ; }