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?

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Solution

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.

Probability =

Probability (a pair of white socks will be formed) =

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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. Probability = Probability (a pair of white socks will be formed) =

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.

Probability =

Probability (a pair of white socks will be formed) =