which is false? im really confused with conditional probability P(A l B ) + P( A' l B') = 1 false? P(A l B ) + P( A l B') = 1 false? but why?
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Originally Posted by alexandrabel90 which is false? im really confused with conditional probability P(A l B ) + P( A' l B') = 1 false? P(A l B ) + P( A l B') = 1 false? but why? Both of those are false. It is true that $\displaystyle P(A|B)+P(A^c|B)=1$ That is easy to see because $\displaystyle P(A\cap B)+P(A^c \cap B)=P(B)$
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