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Byju's Answer
Standard XII
Mathematics
Dot Product
If a = 1 , ...
Question
If
a
=
(
1
,
−
1
)
and
b
=
(
−
2
,
m
)
are two collinear vectors then
m
is equal to :
A
4
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B
3
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C
2
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D
0
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Solution
The correct option is
C
2
Given
a
=
(
1
,
−
1
)
and
b
=
(
−
2
,
m
)
Given that above two vectors are collinear , so they are parallel
⇒
1
−
2
=
−
1
m
⇒
m
=
2
Therefore correct option is
C
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0
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