UPSC NDA I 2015 Mathematics Solved Paper

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Question : 21 of 120

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(x3−1) can be factorised as
Where ω is one of the cube roots of unity.

[NDA I 2015]

(x−1)(x−ω)(x+ω2)
(x−1)(x−ω)(x−ω2)
(x−1)(x+ω)(x+ω2)
(x−1)(x+ω)(x+ω2)

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