Multiple choice

Directions: Find out the incorrect number in the given series 8, 15, 24, 35, 50, 63, 80

  1. 50

  2. 24

  3. 35

  4. 15
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The series follows the pattern n^2 - 1: 3^2-1=8, 4^2-1=15, 5^2-1=24, 6^2-1=35, 7^2-1=48 (not 50), 8^2-1=63, 9^2-1=80. Thus, 50 is the incorrect number.

AI explanation

The correct series follows a pattern based on the squares of consecutive integers, specifically n squared minus 1 starting with n = 3. Working this out, the terms should be 3 squared minus 1 = 8, 4 squared minus 1 = 15, 5 squared minus 1 = 24, 6 squared minus 1 = 35, 7 squared minus 1 = 48, 8 squared minus 1 = 63, and 9 squared minus 1 = 80. Since 48 should be in the fifth position instead of 50, the incorrect number is 50. The result is 50.

Keep practicing — related questions