# A bag contains 4

Given, There are total of 4 balls in a bag.

To Find: What is the probability that all the balls are white

Explanation: We have a total 4 balls in a bag.

And, Two Balls are drawn at random and are found to be white

Let us Consider the events,

E1 = The bag contains two white and two other balls

E2 = The bag contains three white and one other ball

E3 = The bag contains all four white balls

And,

A = Two balls drawn are white.

So,

P(E1) = P(E2) = P(E3) = 1/3

2C2/4C2

2C2/4C2

2C2/4C2

According to Bayes Theorem ,

Hence, This is the required probability.

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