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How many three-lettered passwords can be formed using the English alphabet, such that the three letters are different?

 
263 - 1
263 - 26
26 × 25 × 24
26! - 26
None of these

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Please explain this question How many three-lettered passwords can be formed using the English alphabet, such that the three alphabets should not be the same? correct answer: Total passwords = 26 × 26 × 26 Out of these 26 will have all the three letters same. = 263 – 26.

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