Question 1201698
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ANSWER: 0<br>
He can't get 3 orange balls and 3 green balls if he chooses only 5 balls from the bag....<br>
To set up the problem for solving, I will assume that he picked 6 balls from the bag instead of 5.<br>
The possible outcomes are all the ways he can choose 6 of the 12 balls.<br>
The good outcomes are the ways he can choose 3 of the 8 orange balls and 3 green balls.<br><pre>
                                       C(8,3) * C(4,3)
  P(3 of 8 orange AND 3 of 4 green) = -----------------
                                           C(12,6)</pre>
Use a calculator; and round the answer as directed....<br>