Multiple choice

Directions: In the following series one number is wrong which does not follow the pattern. Find the wrong number. 2, 3.4, 6.2, 11.8, 25, 45.4, 90.2

  1. 25

  2. 11.8

  3. 45.4

  4. 3.4

  5. 90.2
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A Correct answer
Explanation

Pattern: x * 0.5 + 2.4. 2 * 0.5 + 2.4 = 3.4. 3.4 * 0.5 + 2.4 = 4.1 (not 6.2). The series is inconsistent.

AI explanation

The differences between the consecutive terms are 1.4, 2.8, 5.6, 11.2, 22.4 and 45.4, which clearly doubles each time. Based on this doubling pattern, the fifth difference should be 13.2, making the sixth term 11.8 + 13.2 = 25 instead of 25. The wrong number is 25.

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