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JEE MATHEMATICS MCQ: PERMUTATIONS

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How many four digit numbers can be formed using the digits 1, 2, 3, 4, 5 such that at least one of the digit is repeated?

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Correct option: D

{5^4} - 5!

Option D (

{5^4} - 5!

) is correct because it subtracts the number of four-digit numbers with no repetition from the total number of four-digit numbers that can be formed.

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