General Aptitude - 18.4 Odd Man Out and Series - Find Wrong No. Free Online Tests | Mock Tests | Preparation | Practice Tests

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15, 16, 34, 105, 424, 2124, 12756

A. 16

B. 34

C. 105

D. 2124

E. None of the above

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Correct choice: D

Explanation:

2^nd term = (1^st term) x 1 + 1 = 15 x 1 + 1 = 16.

3^rd term = (2^nd term) x 2 + 2 = 16 x 2 + 2 = 34.

4^th term = (3^th term) x 3 + 3 = 34 x 3 + 3 = 105.

5^th term = (4^th term) x 4 + 4 = 105 x 4 + 4 = 424

6^th term = (5^th term) x 5 + 5 = 424 x 5 + 5 = 2125

∴ 6^th term should 2125 instead of 2124.

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