Instructions

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

Question 171

12, 6.5, 7.5, 12.75, 27.5, 71.25, ?

Solution

The given series is based on the following sequence,

(12+1)*0.5 = 6.5

(6.5+1)*1 = 7.5

(7.5+1)*1.5=12.75

(12.75+1)*2 = 27.5

(27.5+1)*2.5 = 71.25

(71.25+1)*3 = 216.75

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