document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=326901>Question 326901</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a small school bus contains 8 first graders and 10 second graders. if 2 children were ill, what is the probability that at least one of them is a second grader?<BR>\n" );
document.write( "thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #234108 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=234108\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let's find the probability that both are first graders.<BR>\n" );
document.write( "P(1st 1st)=8/18=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%2F9 ALIGN=MIDDLE  ALT=\"4%2F9\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "P(2nd 1st)=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7%2F17 ALIGN=MIDDLE  ALT=\"7%2F17\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "P(2 1st)=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%284%2F9%29%287%2F17%29=28%2F153 ALIGN=MIDDLE  ALT=\"%284%2F9%29%287%2F17%29=28%2F153\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "\"At least 1 second grader\" means \"not both 1st graders\".<BR>\n" );
document.write( "P(both 1st)+P(not both 1st)=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1 ALIGN=MIDDLE  ALT=\"1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "P(not both 1at)=1-28/153=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=125%2F153 ALIGN=MIDDLE  ALT=\"125%2F153\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "P(at least 1 2nd)=<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=125%2F153 ALIGN=MIDDLE  ALT=\"125%2F153\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );