Pgee 2013

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

we have to see the worst case what can happen
In first draw suppose we pulled black sock and in second draw we pulled blue sock , so we have to do one more draw as in third draw we can pull either black or blue and whatever we will draw a matching pair is guaranteed
so 3 pull required at minimum

Comments

Got it thanks