There are five marbles in a bag. Three are green and two are yellow. You draw a
marble, replace it, and then draw another. What is the probability of choosing two
yellow marbles?
Answer:if You take one after the other, then,for the first one you have 2/5 then for the second one the probability is 1/4 (cause you removed the other one), therefore you get 2/5 * 1/4 = 2/20.