Lily goes to bed at 11:00 p.m. She sleeps for 8 hours. What time did she wake up?
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The probability of picking a black ball first is 
, because there are 4 black balls and 1 white ball which is 5 balls in total. After picking the first ball, 4 balls remain - 3 black and 1 white, so the probability of picking a white ball is 
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So, the probability of picking a black ball first followed by a white ball is
So, the probability of picking a black ball first followed by a white ball is