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if n is a positive integer,what is the remainder when 3^(8n+3) + 2 is divided by

分类: 作业答案 • 2021-12-29 17:00:41

问题描述：

if n is a positive integer,what is the remainder when 3^(8n+3) + 2 is divided by
a.0 b.1 c.2 d.3 e.4
need detailed explanation!thx

答

如果N是正整数,当3^(8n+3) + 2 被5整除的余数是多少?
8n+3 when divided by 4 gives a remainder of 3.
Since powers of 3 make cycles of 4 i.e.3,9,27,81,..3,..9,..7,..1,..3
so 38n+3 will have 7 at the units place.
when 2 is added we get 9 at the units place.
Thus when divided by 5 we get 4 as remainder.
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if n is a positive integer,what is the remainder when 3^(8n+3) + 2 is divided by

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