1, 2, 3, 6, 9, 18, ?, 54

Choose the missing terms out of the given alternatives : PMT, OOS, NQR, MSQ, ?

7, 26, 63, 124, 215, 342, ?

Choose the missing terms out of the given alternatives : J2Z, K4X, I7V, ? , H16R, M22P

24, 60, 120, 210, ?

5760, 960, ?, 48, 16, 8

240, ?, 120, 40, 10, 2

Choose the missing terms out of the given alternatives : C4X, F9U, I16R, ?

Choose the missing terms out of the given alternatives : AZ, GT, MN, ?, YB