UPSC NDA II 2025 Mathematics Paper

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Question : 67 of 120
 
Marks: +1, -0
How many of the following can be a vector perpendicular to both the vectors 2
‌
i
−
‌
j
+
‌
k
 and
‌
i
+
‌
j
+3
‌
k
 ?
I. 4
‌
i
+5
‌
j
−3
‌
k

II. −8
‌
i
−10
‌
j
+6
‌
k

III. ‌
1
50
(−4
‌
i
−5
‌
j
+3
‌
k
)

Select the correct answer.
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