Instructions

What should come in place of the question mark (?) in the following number series?

Question 158

4, 13, 17, ?, 30, 39

Solution

The pattern here followed is :

4 + 9 = 13

13 + 4 = 17

17 + 9 = 26

26 + 4 = 30

30 + 9 = 39

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