When positive integer x is divided by 5, the remainder is 3; and when x is divided by 7, the remainder is 4.When positive integer y is divided by 5, the remainder is 3; and when y is divided by 7, the remainder is 4.If x > y, which of the following must be a factor of x - y?
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发表于 2008-10-28 10:00:00
