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UPSC NDA I 2023 Mathematics Solved Paper

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Consider the following for the next two (02) items that follow :

Consider two lines whose direction ratios are

(2,-1,2)

and

(k, 3,5)

. They are inclined at an angle

\; \frac{\pi}{4}

.

[NDA I 2023]

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Question : 64 of 120

Marks: +1, -0

What are the direction ratios of a line which is perpendicular to both the lines?

$(1,2,10)$
$(-1,-2,10)$
$(11,12,-10)$
$(11,2,-10)$

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