document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=430856>Question 430856</A>: <I><SPAN STYLE=\"word-break: break-all;\"> There are 10 rolls of filmin a box and 3 are defective.  Two rolls will be selected, one after the other.  What is the probability of selecting a defective roll followed by another defective roll? </SPAN>\n" );
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document.write( "probability that first roll is defective = 3/10\r<BR>\n" );
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document.write( "probability that second roll is defective = 2/9\r<BR>\n" );
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document.write( "required probability = 3/10 * 2/9\r<BR>\n" );
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document.write( "= 1/15\r<BR>\n" );
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document.write( "another method.....\r<BR>\n" );
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document.write( "probability = 3C2 / 10C2\r<BR>\n" );
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document.write( "= 3/ 45\r<BR>\n" );
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document.write( "= 1/15\r<BR>\n" );
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document.write( " </SPAN>\n" );
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