Choose the option that shall come in place of the ? in the following series:
25WV52, 23TS32, 21QP12, ?, 17KJ71
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 19NM91
1. The First Number
The first numbers in each term are decreasing by 2:
- 25 - 2 = 23
- 23 - 2 = 21
- 21 - 2 = 19
- 19 - 2 = 17
2. The Letter Pair
The letters in each pair are decreasing by 3 positions in the alphabet:
- First Letter: W (23) → T (20) → Q (17) → N (14) → K (11)
- Second Letter: V (22) → S (19) → P (16) → M (13) → J (10)
3. The Last Number
The numbers at the end of each term are simply the reverse of the numbers at the beginning:
- 25 reversed is 52
- 23 reversed is 32
- 21 reversed is 12
- 19 reversed is 91
- 17 reversed is 71
Conclusion
Combining these patterns (19, NM, 91), the missing term is 19NM91.