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UPSC NDA 2 2021 Mathematics Solved Paper

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Question : 68 of 120
 
Marks: +1, -0
If (
→
a
+
→
b
) is perpendicular to
→
a
 and magnitude of
→
b
 is twice that of
→
a
, then what is the value of (4
→
a
+
→
b
)â‹…
→
b
 equal to?
[NDA-II 2021]
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