document.write( "Question 392131: Dan have 12 books on his shelf that he has not read yet.There are seven novel and five biographies.He wants to take 4 books with him on vacation.What is the probability that he randomly select two novels and 2 biographies?
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Algebra.Com's Answer #278343 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( "12 books, 7 of which are novels and 5 of which are biographies
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document.write( "Total ways of choosing 4 books from a group of 12 books =  12C4
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document.write( "P(2 novel 'and' 2 biographies) = 7C2*5C2/12C4 =  21*10 /495 = .4242
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document.write( "where nCx =  \n" );
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