KEAM 2014 Math Paper

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Question : 4 of 120
 
Marks: +1, -0
Let
a
=
i
2
j
+3
k
.
If
b
is a vector such that
a
.
b
=
|
b
|2
and |
a
b
|
=7
,
then |
b
|
=
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