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在等差数列{an}中,若a3+a8+a13=C,则其前n项和Sn的值等于5C的是...
在等差数列{an}中,若a3+a8+a13=C,则其前n项和Sn的值等于5C的是( )
A.S15
B.S17
C.S7
D.S8
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