document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1022580>Question 1022580</A>: <I><SPAN STYLE=\"word-break: break-all;\"> P (A or B)= 1/4, P (A)= 1/6, and P (A and B)= 1/7 find P (B) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #638246 by </B><A HREF=/tutors/aboutme.mpl?userid=fractalier><B>fractalier(6550)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=fractalier><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=fractalier><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=638246\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Normally<BR>\n" );
document.write( "P(A or B) = P(A) + P(B) - P(A and B)<BR>\n" );
document.write( "Let's plug in and find P(B)<BR>\n" );
document.write( "1/4 = 1/6 + P(B) - 1/7<BR>\n" );
document.write( "so that <BR>\n" );
document.write( "P(B) = 1/4 - 1/6 + 1/7<BR>\n" );
document.write( "P(B) = 21/84 - 14/84 + 12/84<BR>\n" );
document.write( "P(B) = 19/84 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );