Use the formula for the sum of the first n integers to evaluate the sum given below, then write it in closed form. (a) 6 + 7 + 8 + 9 + ... + 500 125235 (b) 6 + 7 + 8 + 9 + ... + k k^2 + / 2
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Step 1: Use the formula for the sum of the first n integers: \( \frac{n(n+1)}{2} \) Show more…
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