题干
阅读理解
Item |
|
|
|
|
Mona's room | On the sofa | On the table | On the floor | On the bed |
Frank's room | Under the chair | In the bookcase | Under the notebook | In the bookcase |
Mike's room | On the bed | In the schoolbag | Under the desk | On the sofa |
根据表格所提供的信息选择最佳答案。
中，前n项和为
，若
，
，则公比
的值是 （ ）