Number Series - Type 3

In the following number series only one is wrong. Find out the wrong number.

2, 7, 30, 138, 524, 1557, 3102

Answer: Option C

Explanation:

(2 - 1) x 7 = 7; (7 - 2) x 6 = 30; (30 - 3) x 5 = 135; (135 - 4) x 4 = 524;
(524 - 5) x 3 = 1557; (1557 - 6) x 2 = 3102

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