试题与答案

等比数列{an}的前n项和为sn,且4a1,2a2,a3成等差数列.若a1=1,

题型:填空题

题目:

等比数列{an}的前n项和为sn,且4a1,2a2,a3成等差数列.若a1=1,则s4=______.

答案:

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