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Introduction
Finding the Lowest Common Denominator
Arithmetic Sequence and Series
Finding Unit Digits of x^n
  FINDING UNIT DIGITS OF X^N
The solution to finding the unit digit of 32007 – 22007:

If the unit digit of 32007 is 7 and the unit digit of 22007 is 8. Then I can subtract 8 from 7, but is that right because 7 – 8 = -1?
Confused student looking at blackboard
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