An, urn contains 12 balls of which 3 are marked. If 5 balls are drawn-out together. What is the probability of all 3 of the marked balls are among these 5?
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An, urn contains 12 balls of which 3 are marked.
If 5 balls are drawn-out together.
What is the probability of all 3 of the marked balls are among these 5
12+3+5×3+5=28
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