问题
选择题
若等比数列{an}满足anan+1=16n,则公比为( )
A.2
B.4
C.8
D.16
答案
答案:B
∵数列{an}为等比数列,设公比为q,
则anan+1=q=16n>0,∴q>0,
∴=
=16=q2,
∴q=4.故选B.
若等比数列{an}满足anan+1=16n,则公比为( )
A.2
B.4
C.8
D.16
答案:B
∵数列{an}为等比数列,设公比为q,
则anan+1=q=16n>0,∴q>0,
∴=
=16=q2,
∴q=4.故选B.