Plz answer the 17 question
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https://www.meritnation.com/ask-answer/question/1-prove-that-a-ar-ar2-arn-1-a-1/math/3417208
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https://www.meritnation.com/ask-answer/question/1-prove-that-a-ar-ar2-arn-1-a-1/math/3417208
Regards