1.6,19,36,55,() A.69 B.73 C.78 D.81
2. 2,3,6,5,( ),7,20 A.12 B.11 C.10 D.8
3.3186,4369,5408,7639,8324,() A.9182 B.9324 C.10025 D.11237
4.2,-3,1,10,11,() A.17 B.32 C.89 D.111
5.11,7,(),25,43 A.23 B.21 C.18 D.14