In the following question, a matrix of certain characters is given. These characters follow a certain trend, row-wise or column-wise. Find out this trend and choose the missing character accordingly.
| 13 | 12 | 5 |
| 17 | 15 | 8 |
| 25 | 24 | ? |
|
29 |
21 | 20 |
Option:
A. 7
B. 9
C. 11
D. 15
Answer: A . 7
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Justification:
Clearly, (3rd column)2 + (2nd column)2 = (1st column)2
In the first row, 52 + 122 = 132.
In the second row, 82 + 152 = 172.
Let the missing number in the third row be y.
Then y2 + 242 = 252 or y2 + 576 = 625 or y2 = 49 or y = 7.
