Multiple choice

Directions: Find the wrong term in the series. 4, 9, 19, 43, 90, 185, 376

  1. 19

  2. 43

  3. 90

  4. 375
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A Correct answer
AI explanation

The correct pattern for this series is to multiply by 2 and add 1 alternately with multiplying by 2 and subtracting 1. Following this rule, 4 x 2 + 1 = 9 and 9 x 2 - 1 = 17, which means 19 is incorrect. The subsequent correct terms are 17 x 2 + 1 = 35, 35 x 2 - 1 = 69, 69 x 2 + 1 = 139, and 139 x 2 - 1 = 277, proving 19 is the wrong number.

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