My teacher gave these notes:(adsbygoogle = window.adsbygoogle || []).push({});

In general, if any two events A and B we find that Pr(B|A)=Pr(B), or equivantly,

Pr(AnB)=Pr(A)Pr(B),

then the events A and B are independent.

but i thought that when A and B are independent then Pr(AnB)=0?

what is my teacher trying to say, have i misunderstood something?

(btw n represents intersection)

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