Question

A bag contains 6 red marbles and 5 black marbles. Two marbles are drawn without replacement from the bag. What is the probability that both of the marbles are black?
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Answer 1

Answer:

Note that there are 16 total marbles. A is simply a set of sequential events. On the first, you have 10/16 chances to draw a red. Supposing this red is not replaced, the chance of drawing a second red will be 9/15; therefore, the probability of A is (10/16) * (9/15) = 0.375