Sum of first 'n' terms of the arithmetic sequence is 3n² +5n. What is – InterviewSolution

1.	Sum of first 'n' terms of the arithmetic sequence is 3n² +5n. What is the sum of its first n+1 terms. Find the sum of its first 10 terms.
Answer» (15) => a + 14D = 8 + 14(6) = 92

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