CBSE Class 12 Math 2019 All India Set 1 Solved Paper

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Question : 22
Total: 29
Let
a
,
b
and
c
be three vectors such that |
a
|
=1
,
|
b
|=2
and |
c
|
=3
. If the projection of
b
along
a
is equal to the projection of
c
along
a
; and
b
,
c
are perpendicular to each other, then find |3
a
2
b
+2
c
|
Solution:  
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