Question 1170026
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a. drawing four balls that are yellow<br>
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>
{{{P(0,0,4) = (C(4,0)*C(2,0)*C(6,4))/C(12,4)}}}<br>
Use a calculator if necessary....<br>
b. drawing a black ball a yellow ball and two green balls<br>
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>
{{{P(2,1,1) = (C(4,2)*C(2,1)*C(6,1))/C(12,4)}}}<br>
Use a calculator if necessary....<br>