Evaluate the following geometric sum.\\ $\sum_{k=4}^{9} 4^{k}$
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The terms of the geometric sum are given by the formula a * r^(n-1), where a is the first term, r is the common ratio, and n is the number of terms. In this case, a = 9, r = 4, and n = 4. So the terms of the geometric sum are 9, 36, 144, 576. Show more…
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