document.write( "Question 1129518: a urn contains 3 white balls and 7 red balls, two balls are drawn at random from the urn without replacement. \r
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Algebra.Com's Answer #746088 by ikleyn(52788) $\"\"$ $\"About$

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document.write( "Notice that 3 + 7 = 10.\r\n" );
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document.write( "The probability under the question is\r\n" );
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document.write( "    P =  =  =  = .\r\n" );
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