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D.140 0,4,16,40,80除以4即 0,1,4,10,20 ----(A) 前後兩項的差是 1,3,6,10 -----(B) 前後兩項的差是 2,3,4 -----(C) C序列的下一個是5,於是B序列的下一個是15,於是A序列的下一個是35,於是原序列的下一個是4*35=140.
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