RRB NTPC · Question 14
Study the given pattern carefully and select the number from among the given options that can replace the question mark (?).
| 7 | 8 | 5 | 8 |
|---|---|---|---|
| 6 | 5 | 4 | 7 |
| 5 | 2 | 2 | 3 |
| 12 | 30 | 12 | ? |
Show answer & explanation
Answer: (A) 35
Explanation
In each column, bottom = first × second − second × third: 7×6 − 6×5 = 12, 8×5 − 5×2 = 30, 5×4 − 4×2 = 12. So 8×7 − 7×3 = 56 − 21 = 35.