Q.4 A box contains pairs of socks of two colours (black and white). I have picked out a white sock. I pick out one more with my eyes closed. What is the probability that it will make a pair?

It can be observed that while closing the eyes, one can draw either a black sock or a white sock. Therefore, there are two possible cases.

\(\frac{n(e)}{n(s)} = \frac{1}{2} \)