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Math Help - Explain solution to probability problem

  1. #1
    Junior Member
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    Jun 2008
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    Explain solution to probability problem

    I'm currently studying for my exam at my uni so i'm going through al the past exam papers. and i got stuck at one of the questions.
    I have attached the question and the solution to the question. What I dont understand is in the solution section. I wasn't sure how to get from the second equation to the third equation.

    please help!!!
    Attached Thumbnails Attached Thumbnails Explain solution to probability problem-picture-2.png   Explain solution to probability problem-picture-1.png  
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