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One term in the series is wrong: 4, 5, 12, 39, 158, 805. Which number is wrong?

Competition practiceNumber Series

A805
B39
C158
D12

Step-by-Step Solution

The rule is

\times 1 + 1, \times 2 + 2, \times 3 + 3, \times 4 + 4, \times 5 + 5

, giving 4, 5, 12, 39, 160, 805; so 158 should be 160.

Answer: C) 158

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