SOLUTION: Given set A={a,b,c,d}, how many different 2-letter arrangements of A are there?

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Question 246637: Given set A={a,b,c,d}, how many different 2-letter arrangements of A are there?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
P=n!/(n-r)! Permutation
n=4, r=2
(4*3*2)/2=12 arrangements
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Ed