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SSC CHSL 2019 PYQ — Question 53

SSC CHSL - 4th July 2019 - Shift 3 • Quantitative Aptitude • Q53

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If (x + 1/x) = 10, then (x3 + 1/x3) is equal to:

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Correct answer: A

Explanation

The Correct Answer is option 1 i.e. 970.

If (a + 1/a) = x

then,

⇒ (a3 + 1/a3) = x3 – 3x

Given

⇒ (x + 1/x) = 10

⇒ (x3 + 1/x3) = 103 – 3 × 10 = 970