Find a formula in n, a, m, and d for the sum (a + md) + (a

Chapter 5, Problem 30E

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Problem 30E

Find a formula in n, a, m, and d for the sum (a + md) + (a + (m + 1)d) + (a + (m + 2)d) +… + (a + (m + n)d), where m and n are integers, n ≥ 0, and a and d are real numbers. Justify your answer.

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