Select the number that can replace the question mark (?) in the following series.
3, 12, 36, 80, ?, 248
Given series 3, 12, 36, 80, ?, 248
take of difference 12-3 = 9, 36-12= 24, 80-36= 44 ,......
Again take difference of difference 24-9 = 15 , 44-24 = 20 next 25 and so on
then 44 + 25 = 69
therefore ? = 80+ 69 = 149 Ans
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