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Number Properties formulae or shortcuts ?

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by II » Fri Jan 11, 2008 4:02 pm
Does anyone have a list of the useful number properties (arithmetic progression) formulae and shortcuts.

E.g. finding greatest common factor between 2 integers, finding least common multiple of 2 numbers, etc etc

Thanks
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by beatthegmat » Fri Jan 11, 2008 8:05 pm
Many of those topics are addressed in the flashcards. I think that mayonnai5e's post in the 'I just Beat The GMAT' area also addresses some of these topics.
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