Question

Which of the following can not be the unit digit of of a perfect square?
6
1
9
8

Answer 1

Answer:

8

Step-by-step explanation:

8 can't be the units digit of a perfect square

4^2=16;6^2=36 ;that end with 6

1^2=1;9^2=81;that end with 1

3^2=9;7^2=49;that end with 9

but there are no squares that end with 8