The direction ratios of two lines AB,AC are 1, -1, -1 and 2, -1,1. The direction ratios of the normal to the plane ABC are

2,3, -1

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2,2,1

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3,2,-1

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-1, 2,3

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Solution

The correct option is A
2,3, -1

$- - \to A B \times - - \to A C = 2^i - 3^j +^k$
$∴ D . r^{'} s o f n o r m a l = (2, 3, - 1)$

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The direction ratios of two lines AB,AC are 1, -1, -1 and 2, -1,1. The direction ratios of the normal to the plane ABC are

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(0, 1, 0)

\frac{π}{4}

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