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How many 3-digit numbers can be formed b...

How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?

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No. of ways of filling first place = 9
No. of ways of filling second place = 8
No. of ways of fillin third place = 7
Therefore, total numbers `= 89 xx 8 xx 7 504`.
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