Question

Which of the following cannot be the unit digit of 8ⁿ, where n is a natural number?

Options

• 4

• 2

• 0

• 6

Answer 1

0

Explanation:

The unit digits of powers of 8 follow a repeating cycle: 8, 4, 2, 6.
Since 0 is not in this cycle, it cannot be the unit digit of 8ⁿ.