sunshinycoast10 sunshinycoast10
  • 21-07-2020
  • Mathematics
contestada

how many 4-digit numbers can be formed using only the digits 9, 8 and 7? :p

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tramserran
tramserran tramserran
  • 21-07-2020

Answer: 81

Step-by-step explanation:

First digit  and    Second digit    and    Third digit    and    Fourth digit

3 choices  x       3 choices          x        3 choices      x       3 choices     = 81

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