单选题:已知数列{an}满足an=3n+1(n为奇数,n∈N) 2n-2(n为偶数,n∈N)则a2·a3=(  )。

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题目内容:
已知数列{an}满足an=3n+1(n为奇数,n∈N) 2n-2(n为偶数,n∈N)则a2·a3=(  )。 A.70
B.28
C.20
D.8
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答案解析:

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