hard · GMAT Quant
The units digit of 6^n is always 6, and the units digit of 4^n cycles through 4, 6 with period 2.
What is the units digit of 6^23 - 4^31?
- 0
- 8
- 2
- 4
- 6
Sign up free to see the explanation and track your rank →
More GMAT Quant practice
- Including both endpoints, how many distinct integer price points are in this range?
- Which of the following expressions must result in a positive value?
- Which property of arithmetic justifies that first step?
- Which of the following must also be an even integer?
- Which of the following inequalities correctly represents this range?
- Which of the following includes the number 0?
- How many unique meal combinations can a customer create?
- What is the probability that the lightbulb is functional?