Question

P(B\A) = P(A intersection B) / P(A)
it is probability mass function, what does P(B\A) denotes here? is it complement of A?

Answer 1

B\A generally denotes B complement A.

Answer 2

does it mean that B is universal set and we can write it as B\A = B-A?

Answer 3

@nbouscal

Answer 4

B\A is generally everything such that \(B\wedge\neg A\) is true. Or more formally, \(x\in(B\backslash A)\implies x\in B \wedge x \not\in A \)