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UPSC NDA I 2017 Mathematics Solved Paper

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Question : 49

Total: 120

If |

x	y	0
0	x	y
y	0	x

|=0,then which one of the following is correct?

x
y
is one of the cube roots of unity
x is one of the cube roots of unity
y is one of the cube roots of unity
x
y
is one of the cube roots of −1

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