Section 1 - Question 2 Alice is deriving the formula for the sum of a finite geometric series. Her work for the first two steps is shown. Assume for each step that r Sn = a₁ + a₂r+a₁² +₁³+...+₁²²-1 rSn = a₁ + a² + a₁²³ +₁²+...+₁² Which of the following is the correct remaining three steps to derive the formula? A B Sn-rSn = a₁-a1 Sn (1-r) = a₁ (1-¹) a₁ (1-1) 1-r Sn = Sn+rSn = a₁ + a₂ S₂ (1+r) = a₁ (1+p²²) Sn = ª1(1+r) 1+r Sn-rSn = a₁a₁-1 S₁ (1-r) = a₁ (1-1) Sn = 8:(1-7)

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