SOLUTION: A bag is filled with 9 white tokens, 5 blue tokens 4 green tokens and 2 red tokens
Two tokens are drawn from the bag without replacement. What is the probability that both tokens
In total, there are 9 + 5 + 4 + 2 = 20 tokens.
With the probability we select blue token at the first draw;
and then with the probability we select blue token at the second draw.
Therefore, the answer to the problem's question is P = = = .