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Math and Arithmetic

Find the number of distinguishable permutations of the letters in the word calculator?

Answer

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June 01, 2009 2:58PM

Total permutations 10! ie factorial 10 = 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 = 3628800. The 2 "c"s are interchangeable which halves this figure to 1814400, similarly the "a"s and "l"s are interchangeable which reduces by half twice more, ie to 907200 and then to 453600.