E = 1/6 + 1/66 + 1/176 +..... + 1/9894 E = 1/6 + 1/66 + 1/176 + ..... + 1/9894
Tham khảo câu trả lời từ Trợ lý ảo Lazi To find the sum of this series, we need to find a pattern in the denominators of the fractions. The denominators of the fractions are increasing by 10 each time: 6, 66, 176, ..., 9894. We can write the denominators as follows: 6 = 6 66 = 6 + 6*10 176 = 6 + 6*10 + 6*10*2 286 = 6 + 6*10 + 6*10*2 + 6*10*3 ... In general, the nth term in the series can be written as: 6 + 6*10 + 6*10*2 + ... + 6*10*(n-1) This is an arithmetic series with first term a = 6 and common difference d = 6*10 = 60. 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