document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=177396>Question 177396</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A can contains 7 pink balls and 5 blue balls. FOUR balls are selected without replacement.  What is the probability of 1) all pink or all blue 2) exactly 3 pink 3) at least 3 pink 4) exaclty 3 pink of 3 blue.  I am studying \"Adding Probabilites\" and I just don't get it? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #132528 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=132528\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A can contains 7 pink balls and 5 blue balls. <BR>\n" );
document.write( "FOUR balls are selected without replacement. <BR>\n" );
document.write( "What is the probability of <BR>\n" );
document.write( "1) P(all pink or all blue) = (7C4 + 5C4)/12C4 <BR>\n" );
document.write( "----------------------------------------------------<BR>\n" );
document.write( "2) P(exactly 3 pink) = 7C3*5C1/12C4<BR>\n" );
document.write( "--------------------------------------------------- <BR>\n" );
document.write( "3) P(at least 3 pink) = P(3 pink) + P(4 pink) = [7C3*5C1]/12C4 + 5C4/12C4<BR>\n" );
document.write( "---------------------------------------------------- <BR>\n" );
document.write( "4) P(exactly 3 pink or 3 blue) = P(3 pink) + P(3 blue)<BR>\n" );
document.write( "=  7C3*5C1/12C4 + 5C3*7C1/12C4<BR>\n" );
document.write( "===================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );