Since any two letters of the alphabet do not duplicate each other, then the number of arrangements of any two letters is the same as the number of permutations of 26 things taken 2 at a time. That is 26! / (26 - 2)!, or 26! / 24!, or (26) (25), or 650.
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120.
the alphabet has 26 letters in it
raisesiresrises------------------------------------They can be arranged in 5!=120 ways.
720
5040