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Select the number that can replace the question mark (?) in the following series. 5, 6, 18, 23, 161, 170, ?
Question

Select the number that can replace the question mark (?) in the following series.
5, 6, 18, 23, 161, 170, ?

A.

1870

B.

1700

C.

1521

D.

1721

Correct option is A

5 + 1 → 6
6 × 3 → 18
18 + 5 → 23
23 × 7 → 161
161 + 9 → 170
170 × 11 → 1870

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