99, 115, 151, ?, 315, 459
Q. What will come in the place of the question mark in the following series?
99, 115, 151, ?, 315, 459
a) 224
b) 215
c) 221
d) 212
e) 218
Sol:
Logic in the series:
99 + 42 = 115
115 + 62 = 151
151 + 82 = 215
215 + 102 = 315
315 + 122 = 459
So, missing term in the series = 215