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 onÂ
then 44 + 25 = 69Â
therefore ? = 80+ 69 = 149 AnsÂ
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