等差数列{an}的前n项和为Sn,若lim n→∞ Sn/n^2=2,则该数列的公差d=A.4 B.2 C.-2 D.-4
问题描述:
等差数列{an}的前n项和为Sn,若lim n→∞ Sn/n^2=2,则该数列的公差d=
A.4 B.2 C.-2 D.-4
答
等差数列{an}的前n项和为Sn,若lim n→∞ Sn/n^2=2,则该数列的公差d=
A.4 B.2 C.-2 D.-4