document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1134973>Question 1134973</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Assume that the box contains 9 balls: 1 red, 5 green, and 3 blue. Two balls are drawn at random, one after the other without replacement.<BR>\n" );
document.write( "What is the probability that the first ball was blue, given that the second was red? </SPAN>\n" );
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document.write( "What is the probability that the first ball was blue, given that the second was red?<br><BR>\n" );
document.write( "That probability is<br><PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "       P(1st was blue and 2nd is red)\r\n" );
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document.write( "   P(2nd is red (and first was any color))<br></PRE><BR>\n" );
document.write( "To find the answer, you need to find the probability that the second ball is red for all the different possibilities for the first ball:<br><PRE STYLE=\"white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;\">\r\n" );
document.write( "A = P(1st red and 2nd red)\r\n" );
document.write( "B = P(1st blue and 2nd red)\r\n" );
document.write( "C = P(1st green and 2nd red)<br></PRE><BR>\n" );
document.write( "Then the probability you are asked to find is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=B%2F%28A%2BB%2BC%29 ALIGN=MIDDLE  ALT=\"B%2F%28A%2BB%2BC%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "(Note that, in this problem, A = 0, because there is only 1 red ball in the box....) </SPAN>\n" );
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