421 and 427, when divided by the same number, leave the same remainder 1. How many numbers can be used as the divisor in order to get the same remainder 1?
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A medium CSAT / General Aptitude multiple-choice question from UPSC Prelims 2024. Attempt it above, then check the correct answer and detailed explanation below.
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Correct answer: B. 2
The difference is 6. Factors leaving remainder 1 for both are 2 and 6.
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