Multiple choice

Directions: Find out the wrong number in the given series. 5 8 10 12 15 18 20 23

  1. 8

  2. 12

  3. 15

  4. 18

  5. 20
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern is +3, +2, +2, +3, +3, +2, +3. If we look at the sequence 5, 8, 10, 12, 15, 17, 20, 23, the differences are 3, 2, 2, 3, 2, 3, 3. The term 12 is the outlier in the pattern of differences.

AI explanation

The pattern in this series involves adding 3, then adding 2, and repeating this alternation indefinitely. The sequence should be 5 + 3 = 8, 8 + 2 = 10, 10 + 3 = 13, 13 + 2 = 15, 15 + 3 = 18, 18 + 2 = 20 and 20 + 3 = 23. Because 13 is required at the fourth position to maintain the pattern, 12 is the wrong number.

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