Current location - Poetry Comprehensive Website - Poetic screen name - It is known that the letters A, A, B and C are printed on the front of four cards. Arrange the four cards at random first. How many different ways are there?

It is known that the letters A, A, B and C are printed on the front of four cards. Arrange the four cards at random first. How many different ways are there?

24 kinds of repetition, 12 kinds of non-repetition, AABC, AACB, ABAC, ACBA, AABC, ABCA, ABAC, ACBA, ACAB, BAAC, BACA, BAAA, BCAA, CABA, CAAB.
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