Multiple choice

In the following number-series one number is wrong. Find out that wrong number. $2478 \quad 819 \quad 257 \quad 84 \quad 24 \quad 5$

  1. $257$
  2. $24$
  3. $5$
  4. $819$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pattern is: divide by 3 and subtract. 2478÷3-19=819, 819÷3-16=257, 257÷3-1≈84.3, 84÷3-4=24, 24÷5-(-0.2)=5. The subtraction amounts decrease by 3, 15, 12, 4.4 (inconsistent). If 257 is wrong and should be 270: 819÷3-19=254, 270÷3-6=84, 84÷3-4=24, 24÷5-(-0.2)=5. This pattern works better.

Keep practicing — related questions