Brainsane
Brainsane Brainsane
  • 21-01-2023
  • Mathematics
contestada

please explain. quick
How many four-digit numbers can you form from the numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9
(a) if you use each digit only once?
(b) if you can repeat each digit?

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