Two dice are rolled. Given that two different numbers come up, what is the probability that one of the dice comes up 6?
What will be an ideal response?
Let A be the event that two different numbers come up, and let ? be the event that one of the dice comes up 6. Then A contains 30 equally likely outcomes (6 ways to choose the number for the first die times 5 ways to choose the number for the second die). Of these 30 outcomes, 10 belong to B, specifically (1,6), (2,6), (3,6), (4,6), (5,6), (6,1), (6,2), (6,3), (6,4), and (6,5). Therefore P(B | A) = 10/30 = 1/3.
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