1 , 3 , 7 , 17 , 41 , ()
A . 49
B . 50
C . 89
D . 99
1,1,3,7,17,41,() A.89;B.99;C.109;D.119 ;
1,1,3,7,17,41,() A.89;B.99;C.109;D. 119;
:1,1,3,7,17,41,()。
:1,1,3,7,17,41,()。A.89 B.99 C.109 D.119