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What is the ones digit in the number 3^2086?

 Sep 28, 2020
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3 9 27 81    3^5 = 243

3^6 = 243*3 = 729

 

So the units digiit appears to cycle  in this roup of 4:      3   9   7   1       3  9  7  1  

2086/4 = 2086/4 = 521  R 2          so units digit will be   9

 Sep 28, 2020

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