试题与答案

已知等差数列{αn}中,a2=7,a4=15,则前10项和S10等于 A.100

题型:选择题

题目:

已知等差数列{αn}中,a2=7,a4=15,则前10项和S10等于

A.100

B.210

C.380

D.400

答案:

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