(4,6,4)
(5,1,4) (5,2,4) (5,6,4) (6,1,4) (6,2,4) (6,6,4)
⎧
⎫
⎪
⎪
⎨
⎬
⎪
⎪
⎩
⎭
B = {(6,5,1), (6,5,2), (6,5,3), (6,5,4), (6,5,5), (6,5,6)}
and
A ∩ B = {(6,5,4)} Now
P(B) =
6
216  and  P (A ∩ B) = 1
216
Then
P(A|B) =
1
P(A
B)
1
216
6
P(B)
6
216
∩
=
=
Example 6  A die is thrown twice and the sum of the numbers appearing is observed
to be 6