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2. (Combinatorics) a. Compute each of the following: 81 PB C b-d: Three balls are selected from an urn containing 15 balls, of which

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2. (Combinatorics) a. Compute each of the following: 81 PB C b-d: Three balls are selected from an urn containing 15 balls, of which 8 are green, 4 are yellow, and 3 are orange. b. How many different combinations of 3 balls are possible? c. How many different combinations of 3 balls will not have any green balls? d. How many different combinations of 3 balls will have one orange, one yellow, and one green ball?

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