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| FINDING
UNIT DIGITS OF X^N |
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What is the unit digit of: 32007 - 22007?
Before
we solve that problem, let’s look at the
unit digits of powers of 3.
31 = 3 and the unit digit is 3
32 = 9 and the unit digit is 9
33 = 27 and the unit digit is 7
34 = 81 and the unit digit is 1
35 = 243 and the unit digit
is 3
36 = 729 and the unit digit is 9
37 = 2187 and the unit digit is 7
38 = 6561 and the unit digit is 1
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