What is the units digit of 3^100?
✓ Correct Answer: Option A
The units digits of powers of 3 follow a cycle of 4: (3, 9, 7, 1). Since 100 is perfectly divisible by 4, the units digit will be the last in the cycle, which is 1.
The units digits of powers of 3 follow a cycle of 4: (3, 9, 7, 1). Since 100 is perfectly divisible by 4, the units digit will be the last in the cycle, which is 1.