| Direction: Insert the correct missing number. |
| 13 | 12 | 5 |
| 17 | 15 | 8 |
| 25 | 24 | ? |
| 29 | 21 | 20 |
A) 7
B) 9
C) 11
D) 15
Correct Answer: A
Solution :
In the first row, \[{{(13)}^{2}}={{\text{(12)}}^{2}}+{{5}^{2}}\] In the second row, \[{{(17)}^{2}}={{(15)}^{2}}+{{(8)}^{2}}\] In the fourth row, \[{{(29)}^{2}}={{(21)}^{2}}+{{(20)}^{2}}\] Let the missing number be x. Then, \[{{(25)}^{2}}={{(24)}^{2}}+{{x}^{2}}\] \[\Rightarrow \] \[{{x}^{2}}\] \[{{(25)}^{2}}-{{(24)}^{2}}=49\] \[\Rightarrow \] \[x=7\]
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