301.  Direction: Which one set of letters when sequentially placed at the gaps in the given letters series shall complete . a - yz - xy - ox - zax - z

302.  CZA, GYE, KXI, ?

303.  6, 10, 18, 34, ?

304.  0, 2, 6, 12, ?, 30, 42

305.  DKM, FJP, HIS, JHV, ?

306.  A, Z, B, Y, C, X, D, W, E, V, F, U, G, ?

307.  Direction: Which one set of letters when sequentially placed at the gaps in the given letters series shall complete . nc-den-edde-n-ddenn-d

308.  24, 6, 18, 9, 36, 9, 24, ?

309.  2, 2, 4, 6, ?, 10, 8, 14, 10

310.  Direction: Number of letters skipped in between adjacent letters in the series increases by one every time. Which of the following series observes this rule?

311.  Y, S,N,J,G, ?

312.  8, 24, 40, 56, ? ,88

313.  48, 82, 44, 77, 40, 72, ?

314.  XGH, WIJ, VKL, UMN, ?

315.  W/S, U/O, S/K, Q/C, ?