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

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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