If a - b = 2 and a3 − b3 = 80, then what will be the value of ab?

12 -24 24 -12

12

a3 - b3 = (a - b)3 + 3ab(a - b) a3 - b3  = 80 = (a - b)3 + 3ab(a - b) = 80 = 23 + 3ab × 2 = 80 = ab = 12