Which decimal digits occur as the final digit of a forth power of an integer?
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Reduce mod . You can just reduce by mod since it will repeat. And those are the possibilities.
Originally Posted by mandy123 Which decimal digits occur as the final digit of a forth power of an integer? Think of a decimal number as So when we raise this to the 4th power we get something like So the last digit will be given by the last digit of the original number raised to the fourth power. The possibilities are (16) (81) (256) etc. I get {1, 5, 6}. -Dan
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