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What will come in place of (?) in the following number series?

1, 3, 7, 13, ?, 31


1. 12
2. 15
3. 21
4. 25
5. 30

1 Answer

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Best answer
Correct Answer - Option 3 : 21

The pattern of the given series :

⇒ 1 + 2 = 3

⇒ 3 + 4 = 7

⇒ 7 + 6 = 13 

⇒ 13 + 8 = 21 

⇒ 21 + 10 = 31 

∴ Answer will be 21 

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