document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1149014>Question 1149014</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If​ P(A and ​B)equals0.3​, ​P(A)equals0.7​, and<BR>\n" );
document.write( "​P(B)equals0.5​, find​ P(A or​ B). </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #770346 by </B><A HREF=/tutors/aboutme.mpl?userid=math_helper><B>math_helper(2461)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=math_helper><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=math_helper><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=770346\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> P(A or B) = P(A) + P(B) - P(A and B)<br>\r<BR>\n" );
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document.write( "You have the numbers for the right hand side...<br>\r<BR>\n" );
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document.write( "It may seem strange to subtract P(A and B), but if you'll notice each of P(A) and P(B) includes P(A and B) (draw Venn diagrams to help see this), then you realize P(A and B) is counted twice.  One P(A and B) must be subtracted to compensate for this overcounting.\r<BR>\n" );
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