BITSAT 2015 Paper

Let A = event that drawn ball is red
B = event that drawn ball is white
Then AB and BA are two disjoint cases of the given event.
∴ P (AB + BA) = P(AB) + P (BA)
= P (A) P (

B

A

) + P (B) P (

A

B

)
=

3

6

.

3

5

+

3

6

.

3

5

=

3

5