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For the question, shouldn't the sum be a(1/1r) since we know lrl < 1 then that r^{n} → 0 as n → ∞? I just don't quite understand why they wrote the sum is a(r/1r). Is there a specific reason they did this? This is just a regular geometric series right? Is there any difference since the sum starts at n = 1 instead of n =0?
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