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Fill in the blanks in the number series given below:

 1, 3, 7, 13, 21, ?, 43


1. 29
2. 30
3. 31
4. 32

1 Answer

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Best answer
Correct Answer - Option 3 : 31

Given: 

1, 3, 7, 13, 21, ?, 43

Calculation:

1, 3, 7, 13, 21, ?, 43

⇒ 1 + 2 = 3

⇒ 3 + 4 = 7

⇒ 7 + 6 = 13

⇒ 13 + 8 = 21

⇒ 21 + 10 = 31

⇒ 31 + 12 = 43

∴ The correct answer is "31".

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