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In deriving Sn for a G.P., subtracting r times Sn from Sn gives (1 - r)Sn equal to what?
Aa - ar^n
Bar - a
Ca - r^n
Da + ar^n
Answer & Solution
Correct answer: A. a - ar^n
Most terms cancel, leaving the first term a minus the last shifted term ar^n.
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