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13 April, 11:24

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

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  1. 13 April, 13:38
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    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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