Which of these cannot be divided evenly into 15 A5 B3 C2 D1 E not of the above?

Answer 1

Divisibility tests:

• A: 5

Last digit of the number is 0 or 5.

Last digit of 15 is 5, so 15 is divisible by 15

• B: 3

Sum the digits of the number; if this sum is divisible by 3, so is the original number.

1 + 5 = 6, which is divisible by 3, so 15 is divisible by 3

• C: 2

Number is even (last digit is divisible by 2)

15 is odd, so 15 is not divisible by 2

• D: 1

All numbers are divisible by 1.

15 is a number, so it is divisible by 1.

Thus 15 is not divisible by C (2).