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October 13th, 2012, 04:45 AM  #1 
Newbie Joined: Oct 2012 Posts: 4 Thanks: 0  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 
October 13th, 2012, 11:55 AM  #2 
Senior Member Joined: Jul 2012 From: DFW Area Posts: 628 Thanks: 92 Math Focus: Electrical Engineering Applications  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. 
October 15th, 2012, 02:31 AM  #3 
Newbie Joined: Oct 2012 Posts: 4 Thanks: 0  Re: Probability Problem
Thanks! now can i understand it.. 

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