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SSC Selection Post 2022 PYQ — Question 59

SSC Selection Post - Graduation Level - 5 Aug 2022 - Shift 3 • Quantitative Aptitude • Q59

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Find the value of x3−1x3x^3 - {{1} \over x^3} when x−1xx - {{1} \over x} = 5 .

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Correct answer: C

Explanation

The correct answer is option 3 i.e. 140.

x - 1/x = 5

⇒ x3 - 1/x3 = 53 + 3(5) = 125 + 15 = 140