Question

A and B are two events such that P (A) ≠ 0. Find P (B|A), if  A is a subset of B.

Answer 1

P (B|A) = `(P (A cap B))/(P (A))`

`= (P (A))/(P(A)) = 1`          ...(∵ A ⊂ B ⇒ A ∩ B = A)

A is a subset of set B.