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M15 #2

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Kudos [?]: 965 [0], given: 621

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M15 #2 [#permalink]

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New post 05 Nov 2010, 14:43
Could someone explain me explanations in 1) is it a rule that when we reverse the fraction the sign shoud be changed vice versa? :oops:
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Kudos [?]: 965 [0], given: 621

M15 #2   [#permalink] 05 Nov 2010, 14:43
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