Mathematics, 24.11.2020 01:30 jacamron
- 11. A 7-digit phone number may not have a 1, 0, or 7 as the first digit but i thenthe rest of the number may use repetition of digits. How many possible phone numbers are there? formula: nCr= n! /(nr)!r!)
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- 11. A 7-digit phone number may not have a 1, 0, or 7 as the first digit but i thenthe rest of the...
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