A . 21
B . 24
C . 31
D . 40
[试题]1,1,2,6,15,()A.21;B.24;C.31;D.40;
[单选题]1/2, 1/2, 1/2,7/16,11/32,( )A. 15/64B. 1/4C. 13/48D. 1/3
[单选题]:1,2,6,15,31,( )A.46B.61C.66D.56
[主观题]1,2,6,15,40,104,()A.273B.329C.185D.225
[单选题]1,2,6,15,31,( )。A.53B.56C.62D.87
[单选题]1,2,6,15,31,( )。A.53B.56C.62D.87
[单选题]1,2,6,15,31,( )。A.53B.56C.62D.87
[单选题]1,2,6,15,40,104,( )。A.233B.256C.273D.296
[单选题]1, 2, 6, 15,40, 104 ()A.273 B.329 C.185 D.225
[单选题]1, 2, 6, 15,40, 104, ( )A.329 B.273C.225 D.185