Unit Digit

1.		What is the unit digit of the product 7 * 8 * 9 * 6 * 5 * 4 * 3 * 2 * 1?

0

1

5

9

2.		Find the unit digit of the square of (49)^2.

1

4

6

9

3.		What is the last digit of the number 2^10 + 3^10 + 4^10 + 5^10?

3

4

5

9

4.		What is the unit digit of 8^15?

4

6

2

8

5.		Which of the following numbers is divisible by 9?

108

237

405

551

6.		Find the unit digit of 7^10 + 8^12 + 9^13.

2

4

6

8

7.		What is the unit digit of 4^12?

2

4

6

8

8.		What is the unit digit of the number 5^17?

5

2

8

7

9.		Find the unit digit of 3^19.

1

3

7

9

10.		What is the last digit of the number 2^17?

1

2

3

4