Correct Answer: 120

Solution : Square the numbers of the first row to get the numbers in the second row. Subtract 2 in the number given in the first row and multiply the resultant by the number given in the first row to get the number of the third row.

In coulmn one: 6→6 ² = (36); 6 × (6 – 2) = 24
In column two: 9→9 ² = (81); 9 × (9 – 2) = 63
Similarly, follow the same pattern in column three: 12→12 ² = (144); 12 × (12 – 2) = 120

So, 120 is the required missing number. Hence, the first option is correct.