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How many two-digit numbers can be formed using the digits 1, 2, 3 and 4 without repeating any digit?

Competition practiceProbability & Permutation
  • A24
  • B16
  • C8
  • D12

Step-by-Step Solution

The tens place has 4 choices and the units place has 3 remaining choices, giving numbers.
Answer: D) 12

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