How about just using the formula for Sn of a geometric sequence?
3(4^8-1)/(4-1) = 4^8-1 = 65535
Q: What represents the sum of a geometric series with 8 terms whose first term is 3 and common ratio is 4.
A: 65,535
Is my answer right? I wasn't sure when adding up the terms versus using Sigma notation.
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