Sean has red, blue, and green marbles in an urn. He draws out the marbles one-at-a-time without replacement. Find the probability that there is at least blue and green marble left in the urn right after the last red marble is selected.
Sean has red, blue, and green marbles in an urn. He draws out the marbles one-at-a-time without replacement. Find the probability that there is at least blue and green marble left in the urn right after the last red marble is selected.
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