Digits

How many five-digit numbers can be written from numbers 0.3,4, 5, 7 that is divided by 10 and if digits can be repeated.

Correct result:

n =  500

Solution:

n=4⋅ 5⋅ 5⋅ 5⋅ 1=500n=4 \cdot \ 5 \cdot \ 5 \cdot \ 5 \cdot \ 1=500

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