KEAM 2015 Math Paper

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Question : 93 of 120
 
Marks: +1, -0
If
a
=λ
i
+2
j
+2
k
and
b
=2
i
+2
j
+λ
k
are at right angle, then the value |
a
+
b
|
|
a
b
|
is equal to
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