document.write( "Question 247538: A box contains 50 razor blades, five of these are known to be used, the remainder unused. What is the probability that exactly 3 will be used.
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Algebra.Com's Answer #180554 by Edwin McCravy(20081) $\"\"$ $\"About$

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A box contains 50 razor blades, five of these are known to be used, the remainder unused. What is the probability that exactly 3 will be used.
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document.write( "The numerator is the number of successful ways, which is the\r\n" );
document.write( "number of ways to select exactly 3 from the 5 used.\r\n" );
document.write( "That's \"5 choose 3\"\r\n" );
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document.write( "or 5C3 = \r\n" );
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document.write( "The denominator is the number of possible ways, which is the\r\n" );
document.write( "number of ways to select exactly 3 from the total 50.\r\n" );
document.write( "That's \"50 choose 3\"\r\n" );
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document.write( "or 50C3 = \r\n" );
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document.write( "So the desired probability is\r\n" );
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document.write( "Edwin

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