Question

In a bag there are 2 red marbles, 3 white marbles and 5 blue marbles. Once a marble is selected, it is NOT replaced. What is the value of probability of selecting a red marble given the first marble is white?

Answer 1

3/9 or 1/2, in simplest form

Answer 2

2 Red marbles, 3 White marbles and 5 Blue marbles. You already selected a White marble so there are 9 marbles left and 2 are Red. So the probability of selecting a Red marble in the next draw is 2/9th's of the time.
 
Final answer: 2/9 or 0.222 rounded to the thousandths place.