Question

A bag contains 4 balls .two balls are drawn at randomand are found to be white. what is the probability that all balls are white?

Answer 1

Two balls are drawn and found white. Now there are two balls in the bag.

D for different color and W for white.

Now remaining two balls could be WW, WD,DD

So probability that all balls are white = 13

Answer 2

The probablity is 4/4.
Because the random ball can be any.