Directions: Identify the missing term that completes the letter series.

ZY, WV, TS, QP, NM, ?, HG, ED

The correct answer is KJ.

To identify the missing term in the series ZY, WV, TS, QP, NM, ?, HG, ED, let us break down the series by observing the alphabetical position of each letter in the English alphabet (where A = 1, B = 2, ..., Z = 26).

Let us write down the numerical positions of the given letter pairs:
ZY → Z = 26, Y = 25
WV → W = 23, V = 22
TS → T = 20, S = 19
QP → Q = 17, P = 16
NM → N = 14, M = 13
? → Missing term
HG → H = 8, G = 7
ED → E = 5, D = 4

Step 1: Determine the pattern for the first letter of each pair
Let us trace the first letters of each pair: Z (26), W (23), T (20), Q (17), N (14), ?, H (8), E (5).

Notice that each first letter is obtained by subtracting 3 from the alphabetical position of the previous pair's first letter:

$26-3=23$ (Letter W)

$23-3=20$ (Letter T)

$20-3=17$ (Letter Q)

$17-3=14$ (Letter N)

Following this rule for the missing pair's first letter:

$14-3=11$

The 11th letter of the alphabet is K.

We can verify this with the next term in the sequence:

$11-3=8$ (Letter H)

Step 2: Determine the pattern for the second letter of each pair
Now, let us trace the second letters of each pair: Y (25), V (22), S (19), P (16), M (13), ?, G (7), D (4).

Similarly, each second letter is obtained by subtracting 3 from the alphabetical position of the previous pair's second letter:

$25-3=22$ (Letter V)

$22-3=19$ (Letter S)

$19-3=16$ (Letter P)

$16-3=13$ (Letter M)

Following this rule for the missing pair's second letter:

$13-3=10$

The 10th letter of the alphabet is J.

We can verify this with the next term in the sequence:

$10-3=7$ (Letter G)

Conclusion:
Combining the two letters, the missing term in the series is KJ.