4,11,6,13,8,().’lO
A.15
B.16
C.17
D.18
:2,18,4,36,8,72,()A.15B.16C.17D.18
3,8,6,11,9,14,(),()。 A.11,16 B.12,17 C.13,17 D.14,18
2,18,4,36,8,72,() A.15B.16C.17D.18
3,4,6,9,(),18 A.11 B.13 C.15 D.17
3,4,6,9,(),18。 A.11 B.12 C.13 D.15
3,5,8,9,13,13,()。A.15B.16C.17D.18