1.

In the following question, select the missing number from the given series._x005F_x000D_  _x005F_x000D_ 15, 22, 31, 42, 55, ?_x005F_x000D_

A. 60_x005F_x000D_
B. 68_x005F_x000D_
C. 70_x005F_x000D_
D. 74
Answer» D. 74


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