From the list of roll numbers provided below, which pair belongs to the same examination centre (i.e., has the same centre code represented by the first three digits)?
| Column A | Column B | Column C | Column D |
| 817129 | 907325 | 338379 | 332896 |
| 333782 | 902345 | 908325 | 908187 |
| 511926 | 184843 | 184320 | 814752 |
| 812783 | 482290 | 817131 | 189901 |
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 123456 and 123789.
Logic: Same examination centre = same first three digits (centre code).
From the given list, the correct matching pairs we found are:
- 817129 & 817131 → (817)
- 908325 & 908187 → (908)
- 184843 & 184320 → (184)
Now we check the options:
123456 & 123789 → both start with 123 (same centre)
123456 & 456123 → 123 ≠ 456
456123 & 789456 → 456 ≠ 789
123789 & 789456 → 123 ≠ 789