單項選擇題2/5,3/7,4/10,6/14,8/20,12/28,( )
A.16/40
B.14/32
C.20/48
D.24/56
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1.單項選擇題1,1,3,7,17,41,( )
A.89
B.99
C.109
D.119
2.單項選擇題18,12,6,( ),0,6
A.6
B.4
C.2
D.1
3.單項選擇題24,12,36,18,54,( )
A.27
B.30
C.42
D.48
4.單項選擇題5,13,37,109,( )
A.327
B.325
C.323
D.321
5.單項選擇題1,4,8,14,24,42,( )
A.76
B.66
C.64
D.68