CBSE Class 12 Math 2020 Outside Delhi Set 2 Solved Paper

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Question : 2
Total: 11
Let
a
=
^
i
2
^
j
+3
^
k
. If
b
is a vector such that
a
,
b
=
|
b
|2
and |
a
b
|
=7
, then |
b
|
equals
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