document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=778402>Question 778402</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a box contains 6 red pens and 4 blue pens. A pen is selected at random the colour is noted and the pen is returned to the box. this procedure is performed a second and then a third time. find the probability of obtaining 3 red pens </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #474614 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=474614\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a box contains 6 red pens and 4 blue pens. A pen is selected at random the colour is noted and the pen is returned to the box. this procedure is performed a second and then a third time. find the probability of obtaining 3 red pens<BR>\n" );
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document.write( "Ans: Since the pen is replaced after each selection the selection<BR>\n" );
document.write( "probabilities are independent.<BR>\n" );
document.write( "Ans: P(3 red with replacement) = (6/10)^3  = 0.027<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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