Question

15,39,74,122,?,256
Find the missing number
a) 151
b) 165
c) 171
d) 185
Pls show solution also

Answer 1

39-15=24,122-74=48=2×24;256-x(missing number)=3×24=72;x=184 .But there isn't any such answer

Answer 2

Option (D) - 185.

Given : 15,39,74,122, ---- 

Explanation : 15 + 24 = 39

                      39 + 35 = 74

                      74 + 48 = 122

                     122 + 63 = 185.