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Source: Manhattan Prep
If a and b are consecutive positive integers, and ab = 30x, is x an integer?
1) a^2 is divisible by 25
2) 63 is a factor of b^2
The OA is C
If a and b are consecutive positive integers, and ab = 30x, is x an integer?
1) a^2 is divisible by 25
2) 63 is a factor of b^2
The OA is C
