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27-04-2020
Mathematics

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How many 4 digit codes are possible if the first digit cannot be 0 and digits can be repeated?

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perriwil0 perriwil0

27-04-2020

Answer: 9,000

Step-by-step explanation: there are 9 number options for the first digit and 10 for the other 3, so 9x10x10x10=9000

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