document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=352829>Question 352829</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In a department store there are 120 customers, 90 of who will buy at least 1 item.  If 5 customers are selected at random, one by one, find the probability that all will buy at least 1 item. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #252230 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=252230\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> In a department store there are 120 customers, 90 of who will buy at least 1 item. If 5 customers are selected at random, one by one, find the probability that all will buy at least 1 item.<BR>\n" );
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document.write( "P(each of 5 buy at least one) = 1 - P(none of 5 buy at least one)<BR>\n" );
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document.write( "Note: There are 30 who will not buy at least one item<BR>\n" );
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document.write( "= 1 - 30C5/120C5<BR>\n" );
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document.write( "= 1 - 0.0000007478<BR>\n" );
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document.write( "= 0.999252....<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. <BR>\n" );
document.write( " </SPAN>\n" );
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