Algebra.Com's Answer #832636 by ikleyn(52803)![\"\"](\"/images/stars/stars-13.gif\")  
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document.write( "An instructor assigns 10 problems and says that the final exam will consist
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document.write( "of a random selection of 5 of them. If a student knows how to solve 7 of the problems,
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document.write( "what is the probability that he or she will answer correctly
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document.write( "a) all 5 problems
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document.write( "b)at least 4 problems
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document.write( "(a) P =  =  = reduce =  . ANSWER\r\n" );
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document.write( " The denominator is the number of all possible quintuples of 10 problems.\r\n" );
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document.write( " The numerator is the number of all possible quintuples of 7 known problems.\r\n" );
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document.write( "(b) P =  =  =  = reduce =  . ANSWER\r\n" );
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document.write( " The denominator is the number of all possible quintuples of 10 problems.\r\n" );
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document.write( " The numerator is the number of all possible quintuples containing 4 or 5 known problems.\r\n" );
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document.write( "Solved, with full explanations.\r
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