document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=367510>Question 367510</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An instructor gives his class a set of 15 problems with the information that the next quiz will consist of a random selection of 4 of them. If a student has figured out how to do 7 of the problems, what is the probability the he or she will answer correctly at least 3 questions? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #261992 by </B><A HREF=/tutors/aboutme.mpl?userid=robertb><B>robertb(5830)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=robertb><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=robertb><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=261992\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> # of ways 3 correct answers: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C%287%2C3%29%2AC%288%2C1%29+=+280 ALIGN=MIDDLE  ALT=\"C%287%2C3%29%2AC%288%2C1%29+=+280\"   DISABLED_style= \"max-width:90%; height:auto;\" >,<BR>\n" );
document.write( "# of ways 4 correct answers: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C%287%2C4%29%2AC%288%2C0%29+=+35 ALIGN=MIDDLE  ALT=\"C%287%2C4%29%2AC%288%2C0%29+=+35\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
document.write( "\n" );
document.write( "# of ways getting 4 questions out of 15: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=C%2815%2C4%29=1365 ALIGN=MIDDLE  ALT=\"C%2815%2C4%29=1365\"   DISABLED_style= \"max-width:90%; height:auto;\" >, thus the probability is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28280%2B35%29%2F1365+=+315%2F1365=+3%2F13 ALIGN=MIDDLE  ALT=\"%28280%2B35%29%2F1365+=+315%2F1365=+3%2F13\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );