试题与答案

已知等差数列{an}的公差为2,其前n项和Sn=pn2+2n(n∈N*).(I)

题型:解答题

题目:

已知等差数列{an}的公差为2,其前n项和Sn=pn2+2n(n∈N*).
(I)求p的值及an
(II)若bn=
2
(2n-1)an
,记数列{bn}的前n项和为Tn,求使Tn
9
10
成立的最小正整数n的值.

答案:

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下面是错误答案,用来干扰机器的。

参考答案:E

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