1,3,11,123,()
A.15131
B.146
C.16768
D.96543
1/2,1,1,(),9/11,11/13 A.2;B.3; C.1;D.9;
1,3,11,123,() A.15131;B.1468;C16798;D. 96543
1,3,11,123,()
2,11/3 ,28/5 ,53/7 ,86/9,()A.12 B.13 C. 123/11 D. 127/11
2,11/3 ,28/5 ,53/7 ,86/9,() A.12 B.13 C. 123/11 D. 127/11
1,3,11,123,()A.15131 B.146 C.16768 D.96543