document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=363823>Question 363823</A>: <I><SPAN STYLE=\"word-break: break-all;\"> There are 4 white balls and 8 black balls in a box. If four balls are randomly selected. The probability that exactly 2 balls are white is:<BR>\n" );
document.write( "a)	0.339 <BR>\n" );
document.write( "b)   	0.406<BR>\n" );
document.write( "c)	0.452<BR>\n" );
document.write( "d)      Other:_______\r<BR>\n" );
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document.write( "The average number of black balls obtained when four balls are randomly selected is:  <BR>\n" );
document.write( "a)	2.333<BR>\n" );
document.write( "b)	1.333<BR>\n" );
document.write( "c)	2.667 <BR>\n" );
document.write( "d)	Other : ______________<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #259475 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=259475\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> There are 4 white balls and 8 black balls in a box. If four balls are randomly selected. The probability that exactly 2 balls are white is:<BR>\n" );
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document.write( "Ans: <BR>\n" );
document.write( "Pick 2 white: 4C2 = 6 ways<BR>\n" );
document.write( "Pick 2 black: 8C2 = 28 ways<BR>\n" );
document.write( "Pick 4 balls randomly: 12C4= 495<BR>\n" );
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document.write( "P(exactly 2 white in 4) = (6*28)/495 = 0.339\r<BR>\n" );
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document.write( "a) 0.339 <BR>\n" );
document.write( "b) 0.406<BR>\n" );
document.write( "c) 0.452<BR>\n" );
document.write( "d) Other:_______<BR>\n" );
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document.write( "The average number of black balls obtained when four balls are randomly selected is:<BR>\n" );
document.write( "P(black) = 8/12 = 2/3<BR>\n" );
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document.write( "Average black of 4 = (2/3)4 = 2.667<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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document.write( "a) 2.333<BR>\n" );
document.write( "b) 1.333<BR>\n" );
document.write( "c) 2.667 <BR>\n" );
document.write( "d) Other : ______________\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );