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Question
Find the remainder when 51439786 is divided by 3. Do this without performing actual division.
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Solution
If a natural number is divided by 5, it has the same remainder when its unit digit is divided by 5.
Here, the unit digit of 981547 is 7 . When 7 is divided by 5, remainder is 2.
Therefore, remainder will be 2 when 981547 is divided by 5.
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