Multiple choice

In the following number series only one number is wrong. Find out the wrong number. 18.3, 20.6, 16, 22.9, 13.7, 24.2, 11.4

  1. 24.2

  2. 18.3

  3. 13.7

  4. 22.9

  5. 20.6
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pattern analysis: 18.3, 20.6 (+2.3), 16 (-4.6), 22.9 (+6.9), 13.7 (-9.2), 24.2 (+10.5), 11.4 (-12.8). The differences are 2.3, -4.6, 6.9, -9.2, 10.5, -12.8 which follow ×(-2), ×(-1.5), ×(-1.33)... pattern. Following the pattern, 24.2 should have been 25.3 (13.7 + 11.6), so 24.2 is wrong.

Keep practicing — related questions