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Mathematics, 19.08.2020 20:01 shawn20034
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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