Question 1184466
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To see the solution/solutions, look into these open sources



https://tardigrade.in/question/the-sum-of-the-infinite-series-1-1-3-1-3-3-6-1-35-3-6-9-1-3-lat2aerj


https://byjus.com/jee-questions/the-value-of-1-plus-1-by-3-plus-1-3-by-3-6-is-equal-to/