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Geometric Sequenceshard
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For a geometric sequence {an}\{a_n\}{an​} with a1=1a_1 = 1a1​=1 and common ratio r=2r = 2r=2, if ∑n=1Nlog⁡2(an)=15\displaystyle \sum_{n=1}^{N} \log_2(a_n) = 15n=1∑N​log2​(an​)=15, what is NNN?