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07-07-2020
Mathematics

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

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shamespiral22 shamespiral22

08-07-2020

Answer:

There are 81 numbers

Step-by-step explanation:

Imagine that you have 4 boxes (one for each digit). In each box, you only have 3 choices for what digit you will do. You have to multiply all of the options (3*3*3*3) and you get 81.

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