Instructions

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

Question 157

9, 15, 27, 45, 69, ?

Solution

The pattern here followed is :

9 + 6 * 1 = 15

15 + 6 * 2 = 27

27 + 6 * 3 = 45

45 + 6 * 4 = 69

69 + 6 * 5 = 99

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