a math problem

[datdat]

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if N >0 and integer, how many consecutive integers following N are needed to insure that at least one of the integers is divisible by another positive integer m?

this is from kbb and the answer is m-1....

could anyone can help me out how to solve this?

Thanks

 

[Streetwolf]

http://forums.studentdoctor.net/showthread.php?t=645168