Looking at the series: 25WV52, 23TS32, 21QP12, ?, 17KJ71
Each term has the pattern: [Number][Letters][Number]
Analyzing the first numbers: 25, 23, 21, ?, 17
The sequence decreases by 2 each time:
25 - 2 = 23
23 - 2 = 21
21 - 2 = 19
19 - 2 = 17
The missing first number is 19.
Analyzing the letter pairs: WV, TS, QP, ?, KJ
Finding alphabet positions:
W = 23, V = 22
T = 20, S = 19
Q = 17, P = 16
K = 11, J = 10
For the first letters: 23, 20, 17, ?, 11
The sequence decreases by 3 each time:
23 - 3 = 20
20 - 3 = 17
17 - 3 = 14 → N
14 - 3 = 11
For the second letters: 22, 19, 16, ?, 10
The sequence decreases by 3 each time:
22 - 3 = 19
19 - 3 = 16
16 - 3 = 13 → M
13 - 3 = 10
The missing letter pair is NM.
Analyzing the last numbers: 52, 32, 12, ?, 71
From the options available with 19NM:
Option 3 gives 19NM91
This completes the pattern: 25WV52, 23TS32, 21QP12, 19NM91, 17KJ71
Therefore, the answer is Option 3.