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In the sequence 1, 2, 4, 8, 16, 32, …, each term after the first is twice the previous term. What is the sum of the 16th, 17th, and 18th terms in the sequence?
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等比数列 首项为1 公比 为2
所以 第16项 17项 18项的和 = 2^15+2^16+2^17= （1+2+4）*2^15=7*2^15 选E
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