document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1127127>Question 1127127</A>: <I><SPAN STYLE=\"word-break: break-all;\">  For a gift exchange 10 people names are written on slips of paper and placed in a bowl. The slips of paper are mixed up and, each person selected one name.\r<BR>\n" );
document.write( "\n" );
document.write( " a) what is the probability that everyone select their own name? \r<BR>\n" );
document.write( "\n" );
document.write( "b) what is the probability that nobody selects his or her own name?\r<BR>\n" );
document.write( "\n" );
document.write( "The answer for a) is about 2.7557(10^7)<BR>\n" );
document.write( "The answer for b) 1-2.7557(10^-7)    I don’t know they got that please help thank u  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #743488 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52790)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=743488\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "To solve the problem &nbsp;(and to understand the solution), &nbsp;you need to be familiar with permutations.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Are you familiar with it ?\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "If not, &nbsp;look into the lessons\r<BR>\n" );
document.write( "\n" );
document.write( "&nbsp;&nbsp;&nbsp;&nbsp;- <A  rel=nofollow HREF=http://www.algebra.com/algebra/homework/Permutations/Introduction-to-Permutations.lesson>Introduction to Permutations</A>\r<BR>\n" );
document.write( "\n" );
document.write( "&nbsp;&nbsp;&nbsp;&nbsp;- <A  rel=nofollow HREF=http://www.algebra.com/algebra/homework/Permutations/PROOF-of-the-formula-on-the-number-of-permutations.lesson>PROOF of the formula on the number of Permutations</A>\r<BR>\n" );
document.write( "\n" );
document.write( "&nbsp;&nbsp;&nbsp;&nbsp;- <A  rel=nofollow HREF=http://www.algebra.com/algebra/homework/Permutations/Problems-on-Permutations.lesson>Problems on Permutations</A>\r<BR>\n" );
document.write( "\n" );
document.write( "in this site.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "For example, &nbsp;to answer &nbsp;a), &nbsp;you need to know &nbsp;that there are  &nbsp;&nbsp;10! = 10*9*8*7*6*5*4*3*2*1  &nbsp;permutations of &nbsp;10 objects,  <BR>\n" );
document.write( "and only one of them is the identical permutation.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "In other words, &nbsp;there are &nbsp;10! = 10*9*8*7*6*5*4*3*2*1 &nbsp;possible outcomes in this game, &nbsp;and only one of them is favorable.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "It gives the answer for &nbsp;a):  &nbsp;&nbsp;Probability = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F10%21 ALIGN=MIDDLE  ALT=\"1%2F10%21\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F3628800 ALIGN=MIDDLE  ALT=\"1%2F3628800\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2.7557%2A10%5E%28-7%29 ALIGN=MIDDLE  ALT=\"2.7557%2A10%5E%28-7%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Notice that your answer for &nbsp;a) &nbsp;is written &nbsp;INCORRECTLY.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "The answer for b), &nbsp;which you printed in your post, &nbsp;is incorrect, too.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );