Question : Directions: In the following question, select the number that can be placed at the sign of the question mark (?) from the given alternatives.
| 3 | 11 | 5 | 45 |
| 2 | 4 | 6 | 44 |
| 3 | 7 | 8 | ? |
Option 1: 72
Option 2: 76
Option 3: 80
Option 4: 84
Correct Answer: 80
Solution : In the row, add the square of the first and the third number and the add second number to the resultant number to obtain the fourth number.
In the first row: 3
2
+ 5
2
= 9 + 25 = 34 and 34 + 11 = 45
In the second row: 2
2
+ 6
2
= 4 + 36 = 40 and 40 + 4 = 44
Similarly, in the third row: 3
2
+ 8
2
= 9 + 64 = 73 and 73 + 7 = 80
So, 80 is the missing number in the given figure. Hence, the third option is correct.
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