1. 1, 5, 19, 81, 411, ( )
A.2473 B.2485 C.1685 D.1857
2. 7, 11, 16, 25, 54, ( )
A.98 B.127 C.172 D.203
3. 1, 7, 20, 44, 81, ( )
A.135 B.168 C.173 D.196
4.3, 8, 17, 32, 57, ( )
A.96 B.100 C.108 D.115
5.2/3, 1/4, 2/15, 1/12, 2/35, ( )
A.2/35 B.3/2 C.1/24 D.5/86
參考答案解析