railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Algebra

If \(\rm \left(x+\frac{1}{x}\right)=7 \) and x > 1, then what is the value of \(\rm \left(x^3-\frac{1}{x^3}\right) \)?

1
174√5
2
144√5
3
164√5
4
154√5
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