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UPSC NDA I 2024 Mathematics Paper

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Question : 69 of 120
 
Marks: +1, -0
For any vector
→
r
, what is (
→
r
â‹…
^
i
)(
→
r
×
^
i
)+(
→
r
â‹…
^
j
)(
→
r
×
^
j
)+(
→
r
â‹…
^
k
)(
→
r
×
^
k
) equal to?
Validate
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