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【单选题】
设n为正整数，在1与n+1之间插入n个正数，使这n+2个数成等比数列，则所插入的n个正数之积等于( )．A.
(1+n)n/2
B.
(1+n)n
C.
(1+n)2n
D.
(1+n)3n
E.
以上答案均不正确
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