How many different 4-digit numbers can be formed from the digits 1, 2, 3, 4, 5, 6 if no digit is used more than once?

Answer and explanation

Correct answer: A. 360

  1. Step 1: The order matters, so use . Step 2. . Answer: 360. Why not the others: 1296: That allows digits to repeat. 15: That ignores the order of the digits. 24: That multiplies and .

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