Discussion
The number of words of three distinct letters formed from the letters of the word "PNTU" is :
Answer: A
The number of words is 24.
PNTU has 4 distinct letters, and a word of three distinct letters is an ordered arrangement of 3 of them:
\[ {}^{4}P_{3} = 4 \times 3 \times 2 = 24 \]
\(2^{4} = 16\) counts subsets of the 4 letters, \(4^{2} = 16\) counts two-letter words with repetition, and \(4^{6}\) has no connection with the count.
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