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How many odd five-digit counting numbers can be formed by choosing digits from the set {1, 2, 3, 4, 5, 6, 7, 8} if digits can be repeated?

 Jun 19, 2021
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8 choices for the first 4 digit. 

4 choices for the last digit. (1, 3, 5, 7)

Any idea how you could approach it from here?

 

=^._.^=

 Jun 19, 2021

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