The letters of the word “MOTHER” are permuted, and all the permutations so formed are arranged in alphabetical order as in a dictionary. Then the number of permutations which come before the word “MOTHER” is
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The letters of the word “MOTHER” are permuted, and all the permutations so formed are arranged in alphabetical order as in a dictionary. Then the number of permutations which come before the word “MOTHER” is
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