Area
Stephaneee
It has to be infinite :) OR if you want to be technical, 4 letters
In the US, there are only 3 letters:NAS
Since you are using in the arrengement the all 4 letters, then there are 4! = 4*3*2*1 = 24 permutations.
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because 4+4=8
there are 4 letters
They are alike because eg.1+1+1+1=4 is the same as 1X4=4
They are numbers.
Since the word MATH does not have any duplicated letters, the number of permutations of those letters is simply the number of permutations of 4 things taken 4 at a time, or 4 factorial, or 24.