1,9,35,91,189,( ) A.301 B.321 C.341 D.361
问题描述：
1,9,35,91,189,( ) A.301 B.321 C.341 D.361
答
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1*1
3*3
5*7
7*13
9*21
11*31=341
1,3,7,13,21,31
2,4,6,8,10
答案是C