document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1168171>Question 1168171</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In how many ways can a doubles game of tennis be arranged from seven boys and five girls if each side must have one boy and one girl? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #792802 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><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=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=792802\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "Probability is an area of mathematics where it is useful to know different methods for solving a problem.<br><BR>\n" );
document.write( "Here is an alternative to the (perfectly good) method shown by the other tutor.<br><BR>\n" );
document.write( "(1) Choose 2 of the 7 boys in C(7,2) = 21 ways<BR>\n" );
document.write( "(2) Choose 2 of the 5 girls in C(5,2) = 10 ways<BR>\n" );
document.write( "(3) Make 2 teams each with one boy and one girl in 2 ways<br><BR>\n" );
document.write( "ANSWER: 21*10*2 = 420 ways.<br><BR>\n" );
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