How many unique ways are there to arrange the letters in the word DEN?

D  E   N

1   2   3

 

3! = 3 * 2 * 1 = 6

 

den

dne

 

edn

end

 

nde

ned

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If you want a universal answer to hecitar's explanation, go to https://www.mathsisfun.com/combinatorics/combinations-permutations.html

It really helped me!