document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=453941>Question 453941</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A teacher has 20 students in her class. She randomly will select 4 students for a project.<BR>\n" );
document.write( "a)Find the probability that a specific group of 4 students is selected \r<BR>\n" );
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document.write( "b)Mary is not to be in the selected group. Find the probability that Mary is in the selected group  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #311839 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=311839\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A teacher has 20 students in her class. She randomly will select 4 students for a project.<BR>\n" );
document.write( "a)Find the probability that a specific group of 4 students is selected<BR>\n" );
document.write( "# of ways to get the \"specific group: 1<BR>\n" );
document.write( "# of ways to select a random group of 4: 20C4 <BR>\n" );
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document.write( "P(get specific grp of four) = 1/20C4 = 1/4845<BR>\n" );
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document.write( "b)Mary is not to be in the selected group. Find the probability that Mary is in the selected group<BR>\n" );
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document.write( "Ans: zero<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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