Multiple choice

Directions: In the following number series, only one number is wrong. Find out the wrong number. 19, 22.5, 29.5, 33, 40, 42.5, 50.5

  1. 29.5

  2. 33

  3. 40

  4. 42.5

  5. 50.5
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The series follows a pattern of adding 3.5, then 7, then 3.5, then 7. 19 + 3.5 = 22.5; 22.5 + 7 = 29.5; 29.5 + 3.5 = 33; 33 + 7 = 40; 40 + 3.5 = 43.5 (not 42.5); 43.5 + 7 = 50.5. The wrong number is 42.5.

AI explanation

The differences between consecutive terms alternate between adding 3.5 and adding 7. Adding 3.5 to 19 gives 22.5, adding 7 gives 29.5, adding 3.5 gives 33, adding 7 gives 40, and adding 3.5 gives 43.5. Therefore, the term 42.5 is incorrect.

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