ANSWER : 72

Explanation : . Series moves from the end following the pattern 5 x 2 + 4 = 14, 14 x 2 + 4 = 32, 32 x 2 + 4 = 68 and so on. Hence, the number 72 should be replaced by 68.

ANSWER : 39

Explanation : . Series follows the pattern � 3 x 1 + 2 = 5, 5 x 2 + 2 = 12, 12 x 3 + 2 = 38; 38 x 4 + 2 = 154 and so on. Hence, number 39 should be replaced with 38.

ANSWER : 19

Explanation : . Series follows the pattern : 4 x 2 + 1 = 9, 9 x 2 + 2 = 20, 20 x 2 + 3 = 43, 43 x 2 + 4 = 90 and so on. Hence, the number 19 should be replaced by 20.