已知等差数列{an}的前n项和为Sn,且S2=10,S5=55,则过点P(n,an)和Q(n+2,an+2)(n∈N*)的直线的斜率是( )
A.4 | B.3 |
C.2 | D.1 |
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已知等差数列{an}的前n项和为Sn,且S2=10,S5=55,则过点P(n,an)和Q(n+2,an+2)(n∈N*)的直线的斜率是( )
A.4 | B.3 |
C.2 | D.1 |
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