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are there any rules of divisibility by 7 and 8

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are there any rules of divisibility by 7 and 8 [#permalink] New post 07 Aug 2006, 07:35
are there any rules of divisibility by 7 and 8?
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 [#permalink] New post 07 Aug 2006, 18:32
Google is your friend here. ^^

Dividing by 8: If the last 3 digits are divisible by 8, so is the entire number. (Ex: 6,008 is divisible by 8 since 008 is divisible by 8. 6,018 is not since 18/8 has a remainder.)

Dividing by 7: There are formulas, but they appeared too complex to explain concisely, and given their complexity I can't imagine they'd be that vital to GMAT performance.
  [#permalink] 07 Aug 2006, 18:32
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are there any rules of divisibility by 7 and 8

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