Revision as of 20:05, 15 September 2008 by Sje (Talk)

$ P(A)=P(A|C)P(C)+P(A|C^c)P(C^c) $

$ P(A|B)=P(A|B \bigcap C)P(C|B)+P(A|B \bigcap C^c)P(C^c|B) $

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Basic linear algebra uncovers and clarifies very important geometry and algebra.

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