if a bar, b&c bar are three vectors which of the following is not correct
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Explanation:
Position vector of P is
a
−
0
=
a
Similarly, Position vector of Q is
b
−
0
=
b
Thus, position vector of the mid-point of PQ should be
2
a
+
b
Hence, Position vector of R is
c
−
0
=
c
, which is equal to
2
a
+
b
Thus,
a
+
b
=2
c
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