Use the formula for the sum of the first n
Chapter 5, Problem 27E(choose chapter or problem)
Problem 27E
Use the formula for the sum of the first n integers and/or the formula for the sum of a geometric sequence to evaluate the sums to write them in closed form.
Execise
53 + 54 + 55 + …+ 5k, where k is any integer with k ≥ 3.
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