Consider a collection of envelopes consisting of 3 red envelopes, 3 blue envelopes, 3 green envelopes, and 3 yellow envelopes. If three envelopes are selected at random, without replacement, determine

Consider a collection of envelopes consisting of 3 red envelopes, 3 blue envelopes, 3 green envelopes, and 3 yellow envelopes. If three envelopes are selected at random, without replacement, determine the probability that at least one envelope is a green envelope.

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