A) \[\pm \frac{3}{\sqrt{50}}\]
B) \[\frac{4}{\sqrt{50}}\]
C) \[\frac{3}{\sqrt{50}}\]
D) \[-\frac{4}{\sqrt{50}}\]
Correct Answer: C
Solution :
\[\frac{3}{\sqrt{{{3}^{2}}+{{4}^{2}}+{{5}^{2}}}}=\frac{3}{\sqrt{50}}.\]
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