【例題】3, 4, 12, 18, 44, ( )
A.44 B.56 C.78 D.79
【例題】0.5, 1, 2, 5, 17, 107, ( )
A.1947 B.1945 C.1943 D.1941
【例題】23, 56, 1130, 5330, ( )
A.111580 B.112430 C.121540 D.111590
【例題】0,0,6,24,60,120,( )
A.180 B.196 C.210 D.216
【例題】2, 14, 84, 420, 1680, ( )
A.2400 B.3360 C.4210 D.5040
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