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| FINDING
UNIT DIGITS OF X^N |
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| Thus, if you divide the exponent
of 3n (where n is a counting number) by 4, the remainder of 1 (R1) corresponds
to a unit digit of 3, R2 → a unit digit of 9, R3 → a unit digit of 7 and
R0 → a unit digit of 1. |
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