AAI ATC Junior Executive 27 Jul 2022 Shift 3 Paper

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Question : 116 of 120

Marks: +1, -0

Find the angle between the planes x + y + z = 1 and x - 2y + 3z = 1.

$\cos ^{−1}⁡ (√{\;{1}/{42}})$
$\cos ^{−1}⁡ (√{\;{2}/{42}})$
$\cos ^{−1}⁡ (√{\;{2}/{21}})$
$\cos ^{−1}⁡ (√{\;{1}/{7}})$

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