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Question

find the remainder when 231 is divided by 5

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Solution

We know that :210 = 1024Now, unit digit of 230 or 210×210×210 = 4 as, unit digit of 4×4×4 is 4Now, unit digit of 231or 230×2 is 8.Now, when 8 is divided by 5, then remainder is 3.Hence, when 231 is divided by 5, then remainder is 3.

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