题干

已知数列{an}的前n项和Sn=n2﹣n,正项等比数列{bn}中,b2=a3,bn+3bn1=4bn2(n≥2,n∈N+),则log2bn=(    )

A:n

B:2n﹣1

C:n﹣2

D:n﹣1

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答案(点此获取答案解析)

A

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