sum = \sum_{n=1}^{\infty} \frac{7(7)^{2n}}{(4)^{3n}}
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7(7) = 49 2n (4) = 8n 3n = 3n n1 = n+1 Now we can substitute these values into the expression: 49 + 8n + 3n + (n+1) = 60 + 12n Show more…
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