Question

Which of the following correctly represent the unit digit of any perfect square number.

• A. 1, 4, 5, 6 ,9
• B. 2, 4, 5, 6, 8
• C. 3, 5, 6, 8, 9
• D. 2, 6, 7, 8, 9

Answer 1

The correct option is A

1, 4, 5, 6 ,9

If a number is a perfect square, then it always ends with 1, 4, 5, 6, 9.

We can observe only 1 represents all the digit.