Instructions

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

Question 131

45, 57, 81, 117, 165, ?

Solution

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Multiples of 12 are added to each number

45 + 12 = 57

57 + 24 = 81

81 + 36 = 117

117 + 48 = 165

165 + 60 = 225

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