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2. (D5) Let n = o(a) and assume that a =bk. Prove that <a >=<b> if and only if n and k are relatively prime.

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2. Let o(a) and assume that a=bk Now, Let La) = <b> Then, we have to and that prove prime. К. are relatively As La>= Lb> andand K are relatively Conversely, let prime. Then ged (n,k) = 1 Given that o(a)=n and a=bk. Then, have to we prove that La>=l6Now, for some osman Let b € <b> Then 6m. 1 = b m. (natky) mx.n. mky b b my (bk) mx e amy amy a € La> so, 6m E La> Therefore,

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