SOLUTION: An urn contains 6 red marbles and 6 black marbles. Two marbles are drawn at random. What is the probability that the first one is red and the second is black if marbles are drawn (

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Question 894390: An urn contains 6 red marbles and 6 black marbles. Two marbles are drawn at random. What is the probability that the first one is red and the second is black if marbles are drawn (a) with replacement and (b) without replacement
Answer by mark_henrhiz(40) About Me  (Show Source):
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A) with replacement
P(red marble AND black marble) = P(red)*P(black)
P(red marble AND black marble) = %286%2F12%29+%2A+%286%2F12%29
P(red marble AND black marble) = 36%2F144+=+1%2F4+=+0.25

B) without replacement
P(red marble and black marble) = %286%2F12%29%2A%286%2F11%29
P(red marble and black marble) = 3%2F11+=+0.27