Set up a generating function and use it to ﬁnd the number of ways in which eleven identical coins can be put in three distinct envelopes (labeled A, B, C) if envelope A has at least three coins in it.

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The Answer of Set up a generating function and use it to ﬁnd the number of ways in which eleven identical coins can be put in three distinct envelopes (labeled A, B, C) if envelope A has at least three coins in it.

Set Up a Generating Function and Use It to ﬁNd