# maths

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How many positive integers N are there such that the least common multiple of N and 1000 is 1000?

• maths -

LCM(1000,n) = 1000n/GCD(1000,n)
so
1000GCD(1000,n) = 1000n
GCD(1000,n) = n

So, all factors of 1000 fit the bill. You can easily figure that out.

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