document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=190784>Question 190784</A>: <I><SPAN STYLE=\"word-break: break-all;\"> in a group of 21 people, seven own an ITouch phone.  If 9 people are selected at random what is the probability that 5 own an ITouch </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #143225 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=143225\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> in a group of 21 people, seven own an ITouch phone. If 9 people are selected at random what is the probability that 5 own an ITouch<BR>\n" );
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document.write( "# of ways to select 5 owning an ITouch: 7C5 = 7C2 = 7*6/1*2 = 21<BR>\n" );
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document.write( "# of ways to select 4 not owning ITouch: 14C4 = 1001<BR>\n" );
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document.write( "# of ways to select 9 without restriction: 21C9 = 293,930<BR>\n" );
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document.write( "Probability = [21*1001]/[293,930] = 0.07152<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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