1.

What will come in place of (?) in the following number series?1, 3, 7, 13, ?, 311. 122. 153. 214. 255. 30

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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