Multiple choice

Find out the wrong number in the following number series. $5 6 15 41 105 230$

  1. $5$
  2. $230$
  3. $41$
  4. $15$
  5. $6$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern is: add 1³, add 2³, add 3³, add 4³. Starting from 5: 5 + 1 = 6, 6 + 8 = 14 (not 15), 14 + 27 = 41, 41 + 64 = 105, 105 + 125 = 230. The number 15 is incorrect because 6 + 8 should equal 14, not 15. This makes 15 the wrong number that breaks the cubic addition pattern.

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