Tham khảo câu trả lời từ Trợ lý ảo Lazi To find the value of A, we can use the formula for the sum of a geometric series: S = a * (r^n - 1) / (r - 1) In this case, a = 2 (the first term), r = 2 (the common ratio), and n = 100 (the number of terms). 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