Multiple choice

In the following number series only one number is wrong. Find out the wrong number.\newline 60.5, 72, 83.5, 98, 112.5, 128

  1. 83.5

  2. 128

  3. 98

  4. 72

  5. 112.5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pattern is based on square roots: each term's square root increases by approximately 0.7. Check: √60.5 ≈ 7.8, √72 ≈ 8.5, √83.5 ≈ 9.1, √98 ≈ 9.9, √112.5 ≈ 10.6, √128 ≈ 11.3. The increments between consecutive square roots are approximately 0.7. If 98 were replaced by 95, the pattern of adding 11.5 would hold throughout (60.5 + 11.5 = 72, 72 + 11.5 = 83.5, 83.5 + 11.5 = 95). Therefore 98 breaks the pattern.

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