MathDB

3

Part of 2002 Finnish National High School Mathematics Competition

Problems(1)

Pairs and probability

Source: Finnish Mathematics Competition 2002, Final Round, Problem 3

11/14/2011
nn pairs are formed from nn girls and nn boys at random. What is the probability of having at least one pair of girls? For which nn the probability is over 0,9?0,9?
probabilityinductioncombinatorics unsolvedcombinatorics