Select the number that will replace the question mark (?) in the table below.
| 6 | 9 | 27 |
| 9 | 4 | 77 |
| 4 | 5 | ? |
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 11
In a number table, find the rule from the complete rows and use it for the incomplete row. Here the third number is the square of the first minus the second:
Row 1: \(6^2-9=36-9=27\)
Row 2: \(9^2-4=81-4=77\)
Row 3: \(4^2-5=16-5=11\)
So the missing number is 11.