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JEE Main 2017 Mathematics question

MathematicsDeterminantsJEE Main 2017

If , then is equal to:

Answer: (2)

Solution

Expand the determinant along the first row:

0·(0 - x x) - x( x·0 - x· x) + (- x)( x x - 0).

This simplifies to

x - x = 0 x = x x = 1,

since forces for r

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Question ID VK-115840