2 years ago

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

1 answer:

7 0

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

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Step-by-step explanation:

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I believe the answer will be around 28

Step-by-step explanation:

Hope this Helped

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