brandylarance62001 brandylarance62001
  • 15-11-2017
  • Mathematics
contestada

How many strings of 4 decimal digit do not contain the same digit twice?

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Sphery
Sphery Sphery
  • 15-11-2017
9*9*8*7

You can choose 9 digits for the first digit, 9 Fót the second (because IT can be 0) and 8 Fót the third etc.. hope this helps
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