`A` and `B` are two events such that `P(A)!=0.` Find `P(B|A)` , if
(i) `A` is a subset of `B`
(ii) `AnnB=0`

Explanation

We know that,

`P(B/A)=frac{P(AnnB)}{P(A)}`

(i) `AnnB=A implies P(AnnB)=P(A)`

`P(B/A)=frac{P(A)}{P(A)}=1`

`P(B/A)=1`


(ii) `AnnB=0 implies P(AnnB)=0`

`P(B/A)=frac{0}{P(A)}=0`

`P(B/A)=0`