document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=395815>Question 395815</A>: <I><SPAN STYLE=\"word-break: break-all;\"> in a serivce center, each constumer takes a number and the numbers are consective. one day, the first constumer took the number x and the last constumer took the number y. how many consutmers visited the center on that day? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #280885 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=280885\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The numbers x, x+1, ..., y were taken that day. To find the number of people who visited, we find the size of the set {x, x+1, ...y}. \r<BR>\n" );
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document.write( "Subtracting x-1 from all terms of the set this is equivalent to the set {1, 2, ..., y-x+1}. Therefore y-x+1 customers visited the service center.\r<BR>\n" );
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document.write( "Note that the answer is not simply y-x...this is because the set is inclusive. </SPAN>\n" );
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