数列{an}的前n项和为Sn,若a1="1,"an+1=3Sn(n≥1),则a6=()A.3×44B.3×44+1C.44D.44+1-高三数学

题目简介

数列{an}的前n项和为Sn,若a1="1,"an+1=3Sn(n≥1),则a6=()A.3×44B.3×44+1C.44D.44+1-高三数学

题目详情

数列{an}的前n项和为Sn,若a1="1," an+1 =3Sn(n ≥1),则a6=(   )
A.3 ×44B.3 ×44+1
C.44D.44+1
题型:单选题难度:偏易来源:不详

答案

A
时,由可得,所以。而,所以,故选A

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