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Mathematics, 28.08.2019 23:00 obastwin2

Let $r$ be the set of primitive $42^{\text{nd}}$ roots of unity, and let $s$ be the set of primitive $70^{\text{th}}$ roots of unity. how many elements do $r$ and $s$ have in common?

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Let $r$ be the set of primitive $42^{\text{nd}}$ roots of unity, and let $s$ be the set of primitive...

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