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How many strings of 4 decimal digit do not contain the same digit twice?

How many strings of 4 decimal digit do not contain the same digit twice?
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How many strings of 4 decimal digit do not contain the same digit twice?

User Arirawr
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9*9*8*7

You can choose 9 digits for the first digit, 9 Fót the second (because IT can be 0) and 8 Fót the third etc.. hope this helps
User Azi
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