Explanation
Reason:
Alternatively, if focusing on divisibility:
Verification:
Thus, 64 is different based on both criteria.
Odd One Out: 64
64 is a perfect square ( ), while the other numbers (60, 48, 42) are not perfect squares.
64 is not divisible by 3, whereas 60, 48, and 42 are all divisible by 3.
60÷3=20 (Divisible by 3)60÷3=20(Divisible by 3)
48÷3=16 (Divisible by 3)
42÷3=14 (Divisible by 3)
64÷3=21.33 (Not divisible by 3)