A) \[\sqrt{{{p}^{2}}+{{q}^{2}}+{{r}^{2}}}\]
B) \[\sqrt{{{p}^{2}}-{{q}^{2}}+{{r}^{2}}}\]
C) \[\sqrt{{{p}^{2}}+{{q}^{2}}}\]
D) \[r\]
E) None of these
Correct Answer: D
Solution :
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