试题与答案

已知等差数列{an},Sn为其前n项和,若S20=100,且a1+a2+a3=4

题型:选择题

题目:

已知等差数列{an},Sn为其前n项和,若S20=100,且a1+a2+a3=4,则a18+a19+a20=(  )

A.20

B.24

C.26

D.30

答案:

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