In each of the questions numbered a sequence of numbers and letters that follow a definite pattern is given. Fach question has a blank space. This blank space 1 to be filled by the correct answer from one of the four given options to complete the sequence without breaking the pattern.
7 : 49 :: ........... : 63
81 : 64 :: ....... : 9
AEF : BIJ :: ........ : OUV
DRIVE : EIDRV :: BEGUM : .........
E x I : 5 x 9 :: ..... : 15 x 21
ANT : CPV :: ..... : DQZ
BCEH, ......., DGKP, EINT
K 11 M, ......., G 15 I, E 17 G
HOSPITAL : PATIENTS :: SCHOOL : ........
If the letters D and E are removed from the English alphabet, then ihie fourth letter is