Which of the following is not an integer?
Show answer & explanation
Correct answer: C
Explanation
Let's check the options:
(3³ - 3)/3 = (27 - 3)/3 = 24/3 = 8 → Integer
√49 = 7 → Integer
2/√2 = √2 → This is an irrational number, not an integer
(5² - 1)/2 = (25 - 1)/2 = 24/2 = 12 → Integer