A digit n > 3 is divisible by 3 but not divisible by 6

A digit n > 3 is divisible by 3 but not divisible by 6. Which one of the following is divisible by 4?

1. 2n
2. 3n
3. 2n + 4
4. 3n + 1

• Answer: The correct option is D
• Explanation:

  Given that n is a digit greater than 3. It is divisible by 3 but not divisible by 6.

  Let n = 9

  Checking the options:

  2n = 2 × 9 = 18, which is not divisible by 4.

  3n = 3 × 9 = 27, which is not divisible by 4.

  2n + 4 = 2 × 9 + 4 = 22, which is not divisible by 4.

  3n + 1 = 3 × 9 + 1 = 28, which is divisible by 4.

• Exam Year: 2020