1.262,264,267,272,280,( )
A.309
B.282
C.292
D.302
2.2,3,7,34,50,175,( )
A.211
B.213
C.215
D.175
4.4,13,36,( ),268
A.97
B.81
C.126
D.179
5.1,3/4,9/5,7/16,25/9,( )
A.15/38
B.11/36
C.14/27
D.18/29
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