Answer : 3. "Both A & B"
Explanation :

Answer: C) Both A & B Explanation: The given number puzzle can be soved in two ways. Logic 1 :: Row 1  - 2 x 3 = 6 , 6 x 3 = 18 Row 2  - 4 x 5 = 20 , 20 x 5 = 100 Row 3  - 3 x 7 = 21 , 21 x 7 = 147   Hence, the missing number could be 3.   Logic 2 :: Row 1 - 6 x (2+1) = 18 Row 2 - 20 x (4+1) = 100 Row 3 - 21 x (6+1) = 147   Hence, the missing number could be 6.   Therefore, 3 or 6 is the right answer.