A. (a) C R D T (b) A P B Q (c) E U F V (d) G W H X
The four groups of letters are
CRDT APBQ EUFV GWHX
The above can be written as
We find that when we take 1st & 3rd letter & 2nd & 4th letter as 2 pairs, the 3rd letter is the next letter alphabetically to the 1st letter.
Similarly the 4th letter is alphabetically the next letter of the 2nd letter.
i.e CD, AB, EF, GH & PQ, UV, WX
Only in CRDT, we have T instead of ‘S’. So, in CRDT ⇒ Option (a)
B. The four groups of letters are
HKNQ ILOR JMPS ADGI
If we notice, we find that 2 letters are missing in the sequence, ie.
HIJKLMNOPQ IJKLMNOPQR
LKLMNOPQRS ABCDEFGHI
We find that only in ADGI, the difference is only one letter between G & I.
Hence it is the odd one out.