Solution: Use the formula for the sum of the first n integers and/or the formula for the
Chapter 5, Problem 21(choose chapter or problem)
Use the formula for the sum of the first n integers and/or the formulafor the sum of a geometric sequence to evaluate the sums
in 20–29 or to write them in closed form.5 + 10 + 15 + 20+· · ·+300
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