Multiple choice

Directions: Find the wrong number in the following number series: 107.5, 109, 112, 115, 119.5, 125, 131.5

  1. 112

  2. 107.5

  3. 119.5

  4. 125

  5. 131.5
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A Correct answer
AI explanation

The differences between the consecutive terms are 1.5, 3, 3, 4.5, 5.5, and 6.5. This sequence of differences reveals a clear arithmetic progression adding exactly 1 at each step, yielding 1.5, 2.5, 3.5, 4.5, 5.5, and 6.5. According to this established pattern, the third term should be 109 + 2.5 = 111.5, which makes 112 the wrong number in the series.

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