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11 May, 20:05

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

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  1. 11 May, 22:20
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    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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