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plss answer

Q.13. Find the sum of n terms: $12\times 5+15\times 8+18\times 11+.........$

Refer the link for the answer similar to your query:

https://www.meritnation.com/ask-answer/question/find-the-sum-to-n-terms-of-the-series-1-2-2-times/sequences-and-series/6299407

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