document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1170026>Question 1170026</A>: <I><SPAN STYLE=\"word-break: break-all;\"> an urn contains 4 green balls 2 black balls and 6 yellow balls. Four balls are selected at random, without being replaced. Find the probability of <BR>\n" );
document.write( "a. drawing four balls that are yellow<BR>\n" );
document.write( "b. drawing a black ball a yellow ball and two green balls </SPAN>\n" );
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document.write( "a. drawing four balls that are yellow<br><BR>\n" );
document.write( "In choosing 4 of the 12 balls, we need to choose (1) 0 of the 4 green; (2) 0 of the 2 black; and (3) 4 of the 6 yellow:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P%280%2C0%2C4%29+=+%28C%284%2C0%29%2AC%282%2C0%29%2AC%286%2C4%29%29%2FC%2812%2C4%29 ALIGN=MIDDLE  ALT=\"P%280%2C0%2C4%29+=+%28C%284%2C0%29%2AC%282%2C0%29%2AC%286%2C4%29%29%2FC%2812%2C4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Use a calculator if necessary....<br><BR>\n" );
document.write( "b. drawing a black ball a yellow ball and two green balls<br><BR>\n" );
document.write( "In choosing 4 of the 12 balls, we need to choose (1) 2 of the 4 green; (2) 1 of the 2 black; and (3) 1 of the 6 yellow:<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=P%282%2C1%2C1%29+=+%28C%284%2C2%29%2AC%282%2C1%29%2AC%286%2C1%29%29%2FC%2812%2C4%29 ALIGN=MIDDLE  ALT=\"P%282%2C1%2C1%29+=+%28C%284%2C2%29%2AC%282%2C1%29%2AC%286%2C1%29%29%2FC%2812%2C4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Use a calculator if necessary....<br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );