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JEEMAIN-2016
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Q)
Let
A
B
C
be a triangle whose circumcentre is at
P
. If the position vectors of
A
,
B
,
C
and
P
are
→
a
,
→
b
,
→
c
and
→
a
+
→
b
+
→
c
4
respectively, then the position vector of the orthocentre of this triangle, is :
(
1
)
→
a
+
→
b
+
→
c
(
2
)
−
[
→
a
+
→
b
+
→
c
2
]
(
3
)
→
0
(
4
)
(
→
a
+
→
b
+
→
c
)
2
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