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Let n be a positive integer. If a = 81n + 25, what is the remainder when a is divided by 9?

 Jan 25, 2021
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Since 81 divides 9, the answer to this question is just the remainder when 25 is divided by 9. That is equal to 7, since 25-18 = 7 and 18 is the largest multiple of 9 smaller than 25

 Jan 25, 2021

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