You have 20 cards and 12 envelopes (labeled 1, 2, . . . , 12). In how many ways can you put the 20 cards into
the envelopes if
(a) the cards are distinct.
(b) the cards are identical.
(c) the cards are identical and no envelope can be left empty.

Question

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The Answer of You have 20 cards and 12 envelopes (labeled 1, 2, . . . , 12). In how many ways can you put the 20 cards into
the envelopes if
(a) the cards are distinct.
(b) the cards are identical.
(c) the cards are identical and no envelope can be left empty.

You Have 20 Cards and 12 Envelopes (Labeled 1, 2