15. If 5 marbles are picked randomly from a box containing 6 blue marbles and 9 yellow marbles. In how many ways can it happen that at least 4 of the marbles are blue? A. 6C4 • 9C1 B. 6C5 • 9C0 C. 6C4 • 9C1 • 6C5 • 9C0 D. 6C4 • 9C1 + 6C5 • 9C0
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In this case, there are two possibilities: either the marble is blue or it is yellow. So there are 2 ways for this case. Next, let's consider the case where 2 marbles are picked. There are three possibilities for this case: Show more…
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