The number of 4–digit numbers that can be made with the digits 1, 2, 3, 4 and 5 in which…

Mathematics · JEE Advanced · NTA ExamsPermutations and Combinations

The number of 4–digit numbers that can be made with the digits 1, 2, 3, 4 and 5 in which at least two digits are identical, is :
  1. 45 – 5!
  2. 505
  3. 600
  4. None of these

Answer

(B) 505

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