Question

Which of the following numbers will replace the question mark (?) in the given series? 3, 7, 13, 21, 31, ?

• A. 43
• B. 41
• C. 42
• D. 44

Answer 1

Answer:

A. 43

3, 7, 13, 21, 31, ? 3 + 4 = 7 7 + 6 = 13 13 + 8 = 21 21 + 10 = 31 Similarly, 31 + 12 = 43.