Question

You have a box containing 10 black and 10 blue socks.what is the minimum number of times you need to pull out so that you have a pair of the same color?

Answer 1

3 is the answer .

Let black socks be B and blue socks be D.

S={BBB,DDD,BBD,DDB}

Either of the outcomes would lead to get atleast one pair.

So,3 times is enough to pull a pair of the same colour.