peachijmin peachijmin 31-10-2017 Mathematics contestada What is the sum of the geometric series in which a1 = −5, r = 3, and an = −405? Hint: r ≠ 1, where a1 is the first term and r is the common ratio. Hint: Image attached OPTIONS: A) Sn = −1,220 B) Sn = 605 C) Sn = −15 D) Sn = −605
