Multiple choice

Directions: In the following number series one number is wrong. Find out the wrong number. 75, 86, 108, 141, 180, 240

  1. 108

  2. 75

  3. 180

  4. 240

  5. 141
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The differences between consecutive terms are: 86-75=11, 108-86=22, 141-108=33, 180-141=39, 240-180=60. The pattern of differences should be 11, 22, 33, 44, 55. Replacing 180 with 141+44=185 makes the sequence consistent (185+55=240).

AI explanation

The differences between the consecutive terms are 11, 22, 33, 39 and 60. The pattern relies on the differences being multiples of 11, specifically 11, 22, 33, 44 and 55. Adding 44 to 141 gives the correct fifth term of 185, which means the listed number 180 is the wrong number.

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