An opaque bag contains 3 green marbles and 3 red marbles. An opaque bag contains 3 green marbles and 3 red marbles. Two marbles are randomly drawn one at a time without replacement. Find the probability the 2nd marble drawn is a red marble, given the first marble drawn was red.
After removing the first red marble from the bag, there will be 3 green marbles and 2 red marbles left. This gives you a 2/5 chance to draw another red one, or a 40% chance.
