Find out the missing number in the following number series.
Q. 15, 30, 55, 90, ?, 210
A.125
B.135
C.145
D.155
E.165
Sol:
15 + 5 * 3 = 30
30 + 5 * 5 = 55
55 + 5 * 7 = 90
90 + 5 * 11 = 145
145 + 5 * 13 = 210
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