Mathematics, 05.08.2019 00:00 larissaday33
For a nonnegative integer $n$, let $r_9(n)$ stand for the remainder left when $n$ is divided by $9.$ for example, $r_9(25)=7.$ what is the $22^{\text{nd}}$ entry in an ordered list of all nonnegative integers $n$ that satisfy $$r_9(5n)\le 4~? $$(note that the first entry in this list is $0$.)
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For a nonnegative integer $n$, let $r_9(n)$ stand for the remainder left when $n$ is divided by $9.$...
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