document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=432702>Question 432702</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Before electronics took over, slot machines were like this: you pull the lever to spin three wheels; each wheel has 20 symbols, all equally likely to show when the wheel stops spinning; the three wheels are independent of each other. Suppose that the middle wheel has 9 cherries among its 20 symbols, and the left and right wheels have 1 cherry each.<BR>\n" );
document.write( "a.) You win the jackpot if all three wheels show cherries. What is the probability of winning the jackpot?\r<BR>\n" );
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document.write( "b.)There are three ways that the three wheels can show two cherries and one symbol other than a cherry. Find the probability of each of these ways.\r<BR>\n" );
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document.write( "c.) What is the probability that the wheels stop with exactly two cherries showing among them? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #299988 by </B><A HREF=/tutors/aboutme.mpl?userid=edjones><B>edjones(8007)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=edjones><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=edjones><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=299988\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a) 1/20 * 9/20 * 1/20 = 9/8000<BR>\n" );
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document.write( "c) <BR>\n" );
document.write( "1/20 * 9/20 * 19/20 * 2 = 342/8000<BR>\n" );
document.write( "(1/20)^2 * 11/20 = 11/8000<BR>\n" );
document.write( "342/8000 + 11/8000 = 353/8000<BR>\n" );
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document.write( "Ed<BR>\n" );
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