alleryIn the word ROOT, why are the letters not all treated as different?
ATwo letters are shortened
BTwo letters are the same
CTwo letters are silent
DTwo letters are stressed
Answer & Solution
Correct answer: B. Two letters are the same
1. Rearranging a word with repeated letters overcounts the arrangements.
2. In this case, the letters of the word are not all different.
3. There are 2 Os, which are of the same kind.
4. So the plain permutation count has to be corrected.
_Source: syllabus Mathematics, Ch 6 'Permutations and Combinations'_
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