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Bunuel
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Here no condition is given regarding the repetition of the letters.Only condition given here is different 4 letter combination should be created. As we can form different 4 letter combinations with repetition, that means repetition of letters is allowed here.


Total combinations = 4 * 4 * 4 * 4 = 256

Option E is the answer.

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You can use each letter more than once, AAAA would be a legit combination following the rules, so there are 4^4 combinations.

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