Ononot — For a geometric sequence \{an\} with a1 = 1 and common ratio

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Geometric Sequenceshard

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For a geometric sequence $\{a_n\}$ with $a_1 = 1$ and common ratio $r = 2$ , if $\displaystyle \sum_{n=1}^{N} \log_2(a_n) = 15$ , what is $N$ ?