If the sum of the squares of the distance of a point from the three...

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If the sum of the squares of the distance of a point from the three coordinate axes be 36 , then its distance from the origin is
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(1) 5
(2) \( 3 \sqrt{2} \)
(3) \( \sqrt{21} \)
(4) \( 3 \sqrt{3} \)
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