ANSWER : 37

Explanation : . Series moves with a difference of 1, 2, 4, 8, 16. Hence, the missing number will be 37.

ANSWER : 18

Explanation : . There are two alternate series 3, 6, 9, 12 and 6, 12, 18�.. Hence, the missing number will be 18.

ANSWER : 82

Explanation : . Series increases and decreases alternatively with a difference of +(1)�, -(1)�, +(2)�, -(2)�, +(3)�,- (3)�, i.e., +1, -1, +4, -8, +9, -27.

ANSWER : 77

Explanation : . Series has been written in reverse order with a difference of (1)�, (1)�, (2)�, (2)�, (3)�, (3)�, i.e., 1, 1, 4, 8, 9, 27.

ANSWER : 10

Explanation : . Series moves with a difference of 1, 1, 2, 2, 3, 3 and so on. Hence, the missing number will be 10.