736.  6, 11, 21, 26, 36, ? , 51

737.  -1, 0. 3, 8, 15, ?

738.  8, 24, 12,? , 18, 54

739.  D, F, I,M,?,X

740.  5, 21, 69, 213, 645,?

741.  127, 131, 139,?, 151, 157, 163, 167

742.  FGHJKLNOPRS ?

743.  5, 11, 24, 51, 106,?

744.  Direction: How many 9 are followed by an even number and preceded by an odd number in the following series? 469259339467924894

745.  70, 71, 76, ? , 81, 86, 70, 91

746.  CAT, FDW, IGZ, ?

747.  LXF, MTJ, NPN, OLR, ?

748.  Direction: The number of letters skipped in between two adjacent letters in this series increases by multiples of 2. Which of the following series does not observe the rule given above?

749.  121, 144, 289, 324, 529, 576, ?

750.  Direction: Which one set of letters when sequentially placed at the gaps in the given letters series shall complete . a _ ca _ ca _ caa _