4!
4 * 3 * 2 * 1
= 24
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Since you are using in the arrengement the all 4 letters, then there are 4! = 4*3*2*1 = 24 permutations.
5040
There are 8! = 40320 permutations.
There are 6! = 720 permutations.
The number of permutations of the letters MASS where S needs to be the first letter is the same as the number of permutations of the letters MAS, which is 3 factorial, or 6. SMAS SMSA SAMS SASM SSMA SSAM