Question

Find the missing number in the sequence.

1, 2, 3, 5, 8, __, 21

• A. 15
• B. 13
• C. 17
• D. None of these

Answer 1

The correct option is B

13

Each term in the series is the sum of the preceding two terms.

Thus, 1 + 2 = 3; 2 + 3 = 5; 3 + 5 = 8 and so on.

Missing number = 5 + 8 = 13.