NDA 2022 Mathematics question
If different permutations of the letters of the word 'MATHEMATICS' are listed as in a dictionary, how many words (with or without meaning) are there in the list before the first word that starts with ?
Answer: (C)
Solution
In alphabetical order the letters are A, A, C, E, H, I, M, M, S, T, T. The words before the first word starting with C are exactly those starting with A. Fixing A
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