document.write( "Question 1166019: a committee of three people is selected at random from a sec system of six teachers, four parents of students, and seven alumni.
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Algebra.Com's Answer #790651 by ikleyn(52812) $\"\"$ $\"About$

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document.write( "the denominator is the number of ways to choose 3 from (6+4+7) = 17, which is   =  = 680.\r\n" );
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document.write( "all teachers is   =  = 20 ways.\r\n" );
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document.write( "So the answer to (a) is  P =  = 0.029412.\r\n" );
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document.write( "no teachers is   =  =  = 165 ways.\r\n" );
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document.write( "So the answer to (b) is  P =  = 0.242647.\r\n" );
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