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How Many Numbers Can Be Formed Using a Certain Number of Digits?

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Question

How many different 3-digit numbers can be formed by using the digits 0,2,5 without repeating any digit in the number?

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Solution

The three-digit numbers formed using the digits 0, 2 and 5 (without repeating any digit in the number) are 250, 205, 502 and 520.
Therefore, four such numbers can be formed.

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