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

User Shalom Peles
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1 Answer

3 votes

Answer: 81

Explanation:

First digit and Second digit and Third digit and Fourth digit

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

User BRAHIM Kamel
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