Discussion
How many three letter words are formed using the letters of the word TIME?
Answer: D
TIME has four distinct letters, and order matters in a word.
\[ {}^{4}P_{3} = 4 \times 3 \times 2 = 24 \]
The corresponding combination \( {}^{4}C_{3} = 4 \) would count only which three letters are used, not how they are arranged.
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