试题与答案

已知等差数列的公差为1,若前4项之和为1,则前8项之和为( ) A.8 B.9

题型:选择题

题目:

已知等差数列的公差为1,若前4项之和为1,则前8项之和为(  )

A.8

B.9

C.17

D.18

答案:

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