document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=66782>Question 66782</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ms.Thomson's class consists of 12 girls and 13 boys. They all put their names in a hat and the teahcer was going to randomly choose two different students to be assistant teachers for the week. What is the probability that it will be a boy and a girl? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #47469 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=47469\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Ms.Thomson's class consists of 12 girls and 13 boys. They all put their names in a hat and the teahcer was going to randomly choose two different students to be assistant teachers for the week. What is the probability that it will be a boy and a girl?<BR>\n" );
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document.write( "Total # of pairs of students is 25C2=300<BR>\n" );
document.write( "Total # of pairs of boys is 13C2=78<BR>\n" );
document.write( "Total # of pairs of girls is 12C2=66<BR>\n" );
document.write( "Therefore # of boy-girl pairs is 300-78-66=156<BR>\n" );
document.write( "So, Prob(goy-girl pair being selected)=156/300<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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