题目内容:
数列{an}、{bn}分别为等比数列与等差数列,a1=b1=1.则b2≥a2.
(1)a2>0;
(2)a10=b10.
则()
A.条件(1)充分,但条件(2)不充分;
B.条件(2)充分,但条件(1)不充分;
C.条件(1)和(2)单独不充分,但条件(1)和条件(2)联合起来充分;
D.条件(1)充分,条件(2)也充分;
E.条件(1)和条件(2)单独不充分,但条件(1)和条件(2)联合起来也不充分.
参考答案:
数列{an}、{bn}分别为等比数列与等差数列,a1=b1=1.则b2≥a2.
(1)a2>0;
(2)a10=b10.
则()
A.条件(1)充分,但条件(2)不充分;
B.条件(2)充分,但条件(1)不充分;
C.条件(1)和(2)单独不充分,但条件(1)和条件(2)联合起来充分;
D.条件(1)充分,条件(2)也充分;
E.条件(1)和条件(2)单独不充分,但条件(1)和条件(2)联合起来也不充分.