A sequence of numbers or letters that follow a definite pattern is given. Each question has a blank space. This has to be filled by the correct answer from the four given options to complete the sequence without breaking the pattern.
7 : 49 :: ------ : 63
81 : 64 :: ----- : 9
AEF : BIJ :: ------ : OUV
DRIVE : EIDRV :: BEGUM : -------
$$E \times I : 5 \times 9 :: ------- : 15 \times 21$$
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