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Westdale

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October 04, 2011

I trade stuff

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 In the answers on this site for ((n-r-1)!)/((n-r-2)!)There is a red ? between the last bracket and the ! . How do I get this to work so that the ? is gone?
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What happened to the 2 in Ag2S Where did it go?
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For the last one CaO should it not be O2 because of diatomic molecules?
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