KEAM 2018 Math Paper

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Question : 55 of 120
 
Marks: +1, -0
If the vector
r
a
=
i
j
+2
k
,
r
b
=2
i
+4
j
+
k
and
r
c
=λ
i
+9
j
+µ
k
are mutually orthogonal, then λ+µ is equal to
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