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October 13th, 2012, 03:45 AM   #1
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Probability Problem

hello, can you solve this problem:
there're 15 bulbs. 3 of them are broken. the bulbs are checked one by one.
what's the chance of getting the third broken bulb on the fifth check
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October 13th, 2012, 10:55 AM   #2
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Re: Probability Problem

Here are the possible picks and their probabilities:













The total is

Adding a little intelligence: You have six possibilities. In each numerator there will be because of the 3 bad bulbs that will not be cancelled in the denominator and that will be cancelled because of the 2 good bulbs. In each denominator there will be that will not be cancelled in the numerator and that will be cancelled.
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October 15th, 2012, 01:31 AM   #3
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Re: Probability Problem

Thanks! now can i understand it..
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