Multiple choice

Which number is wrong in the series? $3, 8, 15, 24, 34, 48, 63$

  1. $15$
  2. $24$
  3. $34$
  4. $48$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series follows the pattern n^2 - 1 for n=2, 3, 4, 5, 6, 7, 8. Specifically: 2^2-1=3, 3^2-1=8, 4^2-1=15, 5^2-1=24, 6^2-1=35, 7^2-1=48, 8^2-1=63. The term 34 is incorrect as it should be 35.

AI explanation

The pattern follows n^2 - 1 for consecutive integer values of n. The terms are 2^2 - 1 = 3, 3^2 - 1 = 8, 4^2 - 1 = 15, 5^2 - 1 = 24, and 6^2 - 1 = 35. Since the given series lists 34 instead of 35, 34 is the wrong term.

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