Скачать или смотреть UPSC CSE Prelims - CSAT 2024 Q.18) 421 and 427

This question is from Series A Question paper of CSAT in UPSC Prelims 2024.

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?
(a) 1
(c) 3
(b) 2
(d) 4

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