How many different 4-letter arrangements can be made from the letters of the word ASSAM?

Question

Accepted Answer

30. Letters: A, A, S, S, M. Case AASS: 4!/2!2!=6. Case one pair plus two others — AA+S+M or SS+A+M: 2×4!/2!=24. All four different is impossible. Total 6+24=30.

How many different 4-letter arrangements can be made from the letters of the word ASSAM?

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