A) 2
B) 6
C) 8
D) 64
Correct Answer: C
Solution :
\[{{5}^{2}}={{3}^{2}}+{{4}^{2}};{{13}^{2}}={{5}^{2}}+{{12}^{2}};{{17}^{2}}={{x}^{2}}+{{15}^{2}}\Rightarrow x=8.\]
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