76.  206, 221, 251, 296, 356, ?

77.  A, CD, GHI, ? , UVWXYZ

78.  ABDC, GHJI, MNPO, ?

79.  113, 225, 449, ?, 1793

80.  7, 9, 13, 21, 37, ?

81.  1, 2, 7, ?, 23, 34, 47

82.  4, 9, 19, 39, ?

83.  BCD, DBC, EFG, ? , HIJ

84.  Direction: Which one set of letters when sequentially placed at the gaps in the given letters series shall complete . p_ _pp q r p _ r

85.  AZ, CX, FU, ?

86.  C, E, I, K, O, Q, ?

87.  Direction: In the following question, number of letters skipped in between adjacent letters of the series starting from behind increased by one. Which of the following observes the rule?

88.  7, 16, 27, 40, 55, ?

89.  2, 6, 12, 20, 30, 42, ?

90.  2, 7, 17, 32, 52, 77, ?