Complete the series: 12, 20, 30, 42, 56, .....

72 70  80 96

72

The given series is like adding a multiple of 2 in increasing order. 12 + 8 = 20 20 + 10 = 30 30 + 12 = 42 42 + 14 = 56 56 + 16 = 72 So the answer will be 72.