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The number of four letter words that can be formed using the letters of the word BARRACK is -

1. (A) 144
2. (B) 120
3. (C) 264
4. (D) 270

Correct answer: (D) 270

Solution

The correct option is 270 because the word 'BARRACK' contains 7 letters with repetitions of 'A' and 'R'. By calculating the permutations of the letters while accounting for these repetitions, we find that there are 270 distinct four-letter combinations.

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