If x is a positive integer, is (10x - 1) divisible by y - The Beat The GMAT Forum

If x is a positive integer, is (10x - 1) divisible by y

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by BTGmoderatorAT » Sat Jan 27, 2018 6:05 am

If x is a positive integer, is (10x - 1) divisible by y

(1) x is a multiple of y
(2) y is a prime number

What's the best way to determine whether statement 2 is sufficient? Can any experts help?

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Source: Beat The GMAT — Data Sufficiency | Sat Jan 27, 2018 6:05 am

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