RRB NTPC · Question 87
Select the number from among the given options that can replace the question mark (?) in the following table.
| 28 | 63 | 94 |
|---|---|---|
| 8 | 18 | ? |
| 6 | 9 | 13 |
Show answer & explanation
Answer: (C) 75
Explanation
In each column the top number = (bottom)² − middle: 6² − 8 = 28 and 9² − 18 = 63. So 13² − ? = 94 gives ? = 169 − 94 = 75.