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15 December, 01:01

How many 7-digit phone numbers can be formed if the first digit cannot be zero and no digit can be repeated

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  1. 15 December, 01:08
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    8 * 9 * 8 * 7 * 6 * 5 * 4
  2. 15 December, 01:12
    0
    If the first digit can not be 0 or 1, then there are 8 choices for the first digit. The other 6 have no restrictions, so there are 10 choices for each of those. 8⋅1000000
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