Multiple choice

In each of the following number series a wrong number is given. Find out the wrong number. 7 8 9 21 9.25 51.25

  1. 7

  2. 9

  3. 8

  4. 9.25

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern is 7×1+1=8, 8×1+1=9 (should be 9), 9×2+3=21, 21÷2+(-1.25)=9.25, 9.25×5+5.25=51.25. The term 9 breaks the pattern - it should likely be different to maintain the sequence logic. The wrong number is 9 at position 3.

Keep practicing — related questions