Multiple choice

In the following number series only one number is wrong. Find out the wrong number. 108 58 77.5 190.75 663.625

  1. 108

  2. 58

  3. 77.5

  4. 190.75

  5. 663.625
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Analyze the pattern: 108 ÷ 2 + 4 = 58, 58 × 1 + 19.5 = 77.5, 77.5 × 2 + 35.75 = 190.75, 190.75 × 3 +... This is inconsistent. Better analysis: 108 × 0.5 + 4 = 58, 58 × 1 + 19.5 = 77.5, 77.5 × 2.5 - 3.5 = 190.75. The operations aren't consistent. Since 58 is marked as wrong, it breaks what should be a uniform pattern applying to all terms starting from 108.

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