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If two positive integers are relatively prime to each other

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If two positive integers are relatively prime to each other [#permalink] New post 16 Sep 2006, 12:55
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If two positive integers are relatively prime to each other and the product of these two integers is 240, then what is the LCM of these two integers?
120
240
80
30
1

P.S. what does relatively prime to eachother mean?
thx! :?
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 [#permalink] New post 16 Sep 2006, 13:02
Relatively prime means has no common facors except one eg(9,10)

xy = 240

lcm*gcf = xy =240

gcf is one thus lcm = 240
  [#permalink] 16 Sep 2006, 13:02
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If two positive integers are relatively prime to each other

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