已知等差数列{an}满足a2=3,a5=9,若数列满足b1=3,bn+1=abn,则{bn}的通项公式为bn=[]A.2n-1B.2n+1C.2n+1-1D.2n-1+2-高三数学

题目简介

已知等差数列{an}满足a2=3,a5=9,若数列满足b1=3,bn+1=abn,则{bn}的通项公式为bn=[]A.2n-1B.2n+1C.2n+1-1D.2n-1+2-高三数学

题目详情

已知等差数列{an}满足a2=3,a5=9,若数列满足b1=3,bn+1=abn,则{bn}的通项公式为bn=
[     ]
A.2n-1
B.2n+1
C.2n+1-1
D.2n-1+2
题型:单选题难度:中档来源:专项题

答案

B

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