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There are four bags. The first bag conta...

There are four bags. The first bag contains 10 identical red balls, the second bag contains 4 identical black balls, the third contains 2 identical green balls and the last bag contain 6 identical blue balls. In how may ways 6 balls can be selected if at least one ball of each colour is selected. A) 9 B) 12 C) 15 D) 18

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