KEAM 2016 Math Paper

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Question : 72 of 120
 
Marks: +1, -0
If
→
a
+
→
b
‌and
‌
→
a
−
→
b
are perpendicular and
→
b
=3
⋀
i
−4
⋀
j
+2
⋀
k
,then‌
|
→
a
|
is equal to
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