Bayes rule
In the probability course, under multiplication rule chapter, author said that
P(A intersection B) = P(A|B) * P(B).
But, in next chapter (Bayes rule), he says
P( A intersection B) = P(B|A)*P(A).
Why the change? Can we use them interchangeably?
I don't know if I am missing something, but I appreciate any assistance.
Thank you.
1 answers ( 0 marked as helpful)
Hey Abhiram,
The two are equivalent since AnB = BnA.
P(A|B) * P(B) = P(A intersection B) = P(B intersection A) = P(B|A) * P(A)
Hence, we can use them interchangeably.
Best,
365 Vik
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