In three of the four letter pairs given below, the first letter is related to the second letter in a similar manner. Identify the odd letter-pair.

Let's analyze all the options:

(a) V → D
V = 22, D = 4
Difference = 22 - 4 = 18
(b) L → B
L = 12, B = 2
Difference = 12 - 2 = 10
(c) N → E
N = 14, E = 5
Difference = 14 - 5 = 9
(d) X → H
X = 24, H = 8
Difference = 24 - 8 = 16
Odd One Out:
The differences in the letter positions are 18, 10, 9, and 16.
All pairs except (N → E) follow an even-number difference (18, 10, 16), whereas N → E has an odd-number difference (9).
Thus, the correct option is  (c) N : E.