A, A, B 
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Permutations with repeatsAdvanced ConceptsRepeat Items in PermutationsCompare the permutations of the letters A,B,C with those of the same number of letters ,3, but with one repeated letter
A, A, B
All the different arrangements of the letters A, B, C
All the different arrangements of the letters A, A, B
(total number of letters)! ÷ (number of repeats)! 3!/2! = (3×2×1)/(2×1) = 3 
If A out of N items are identical, then the number of different permutations of the N items is N!/A!
Permutation Practice Problems Problem 1) How many ways can you arrange the word 'loose'? Answer Top |
