document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=670555>Question 670555</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A bag contains x pink balls and y yellow balls. Three balls are radomly selected from the bag. \r<BR>\n" );
document.write( "\n" );
document.write( "a) Write and expression of the probability that three balls chossen were pink. \r<BR>\n" );
document.write( "\n" );
document.write( "Is this right? Because i wansn't sure  3x/x+y ???\r<BR>\n" );
document.write( "\n" );
document.write( "If there had been one more pink ball, then the probabilty that the three balls chosen were pink would have been double the answer found in a \r<BR>\n" );
document.write( "\n" );
document.write( "b) show that y= x^2- x-2 / 5-x\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Thanks for you help  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #417001 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=417001\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A bag contains x pink balls and y yellow balls. Three balls are radomly selected from the bag. <BR>\n" );
document.write( "a) Write and expression of the probability that three balls chosen were pink. <BR>\n" );
document.write( "Ans: [xC3]/[(x+y)C3]<BR>\n" );
document.write( "-----------<BR>\n" );
document.write( "If there had been one more pink ball, then the probabilty that the three balls chosen were pink would have been double the answer found in a<BR>\n" );
document.write( "-<BR>\n" );
document.write( "(x+1)C3/(x+y+1)C3 = 2[xC3]/(x+y)C3<BR>\n" );
document.write( "----------------------------------<BR>\n" );
document.write( "(x+1)C3/xC3 = 2(x+y+1)C3/(x+y)C3<BR>\n" );
document.write( "(x+1)[xC3/xC3] = 2(x+y+1)[(x+y)C3/(x+y)C3] <BR>\n" );
document.write( "(x+1) = 2(x+y+1)<BR>\n" );
document.write( "x+1 = 2x+2y+2<BR>\n" );
document.write( "------------------------------------<BR>\n" );
document.write( "b) show that y= x^2- x-2 / 5-x <BR>\n" );
document.write( "Note: That is not what I get as an answer.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );