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Answer:
(-∞, 1/5)
Step-by-step explanation:
[tex]f\left( x\right) =\frac{3x-1}{\sqrt{1-5x} }[/tex]
f is defined ,if and only if ,
1 - 5x > 0
⇔ 1 > 5x
⇔ 1/5 > x
⇔ x < 1/5