document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=737654>Question 737654</A>: <I><SPAN STYLE=\"word-break: break-all;\"> two numbers are selected at random from 1 to 9 find the probability that their sum is even? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #450487 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=450487\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  two numbers are selected at random from 1 to 9 find the probability that their sum is even?<BR>\n" );
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document.write( "Consider a 9 by 9 array of these pairs.<BR>\n" );
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document.write( "Consider the sum of each of the 81 pairs in the array.<BR>\n" );
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document.write( "The 1st row of sums looks like: 2,3,4,5,6,7,8,9,10::::: 5 even : 5 odd<BR>\n" );
document.write( "the 2nd row of sums looks like: 3,4,5,6,7,8,9,10,11:::: 4 even : 5 odd<BR>\n" );
document.write( "The 3rd row of sums looks like: 4,5,6,7,8,9,10,11,12::: 5 even : 5 oddc.<BR>\n" );
document.write( "etc<BR>\n" );
document.write( "etc<BR>\n" );
document.write( "etc<BR>\n" );
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document.write( "# of even sums is 5+4+5+4+5+4+5+4+5 = 41<BR>\n" );
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document.write( "P(sum is even) = 41/81<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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