Which pair of letters will come in place of the question mark (?) in the given series?
TD, RI, PN, NS, LX, ?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → JC
In a series of letter pairs, each place in the pair follows its own rule, so the first and second letters are checked separately using their places in the alphabet. After Z the count goes round to A again.
First letters T (20), R (18), P (16), N (14), L (12): each is 2 places back, so next is \(12-2=10\), which is J
Second letters D (4), I (9), N (14), S (19), X (24): each is 5 places ahead, so next is \(24+5=29\), and \(29-26=3\), which is C
So the next pair is JC.