等比数列{an}的依次每k项之和所构成的数列:Sk,S2k-Sk,S3k-S2k,…一定是( 

等比数列{an}的依次每k项之和所构成的数列:Sk,S2k-Sk,S3k-S2k,…一定是(    )

A.等比数列                                       B.等差数列

C.零数列或等比数列                           D.以上都不对

答案

C

解析:q=-1且k为偶数时依次每k项之和构成的数列为0,0,0,….

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