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6 July, 10:21

how many 7-digit phone numbers can be formed if the first digit cannot be 0 or 1, and any digit can be repeated

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  1. 6 July, 13:26
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    8 * 10⁶

    Step-by-step explanation:

    The first digit can be any number from 2 to 9. We can select any of the eight digits.

    We can select the remaining digits in ten different ways.

    Each choice is independent, so we can multiply the choices together.

    N = 8 * 10 * 10 * 10 * 10 * 10 * 10

    = 8 * 10⁶ possibilities

    There are 8 * 10⁶ possible seven-digit phone numbers.
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