Question

What is Bayes' rule?

Answer 1

It is a rule which provides the probability of a cause given the effect.
P(`B_i` /A) = P (`B_i` )P(A/`B_i` )/ `sum` P (`B_i` )P(A/`B_i` ) , where `B_i` is the ith cause and A is the effect.

Explanation:

`uuu` `B_i` = S, `B_i` `nnn` `B_j` = `phi` , `B_i`, i = 1, 2, ... k are the mutually exclusive and collectively exhaustive reasons under which the effect A takes place.