document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=222378>Question 222378</A>: <I><SPAN STYLE=\"word-break: break-all;\"> There are 7 black, 10 blue, 2 red, and 1 yellow marbles.  What is the probability of selecting a black marble and then a blue marble if the marbles are replaced?\r<BR>\n" );
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document.write( "What is the probability if the marbles are not replaced? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #166562 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=166562\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> There are 7 black, 10 blue, 2 red, and 1 yellow marbles. What is the probability of selecting a black marble and then a blue marble if the marbles are replaced? <BR>\n" );
document.write( "If replaced the events are independent.<BR>\n" );
document.write( "P(black then blue) = P(black)*P(blue) = (7/20)*(10/20) = 4/40<BR>\n" );
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document.write( "What is the probability if the marbles are not replaced?<BR>\n" );
document.write( "If not replaced the events are dependent.<BR>\n" );
document.write( "P(black then blue) = P(black)*P(blue|black) = (7/20)*(10/19) = 7/38<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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