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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2.單項選擇題18,12,6,( ),0,6

A.6
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4.單項選擇題5,13,37,109,( )

A.327
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5.單項選擇題1,4,8,14,24,42,( )

A.76
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D.68