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JEEMAIN and NEET
>>
Mathematics
>>
Class11
>>
3-D Geometry
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Q)
The lines
→
r
=
→
a
1
+
λ
→
b
1
and
→
r
=
→
a
2
+
α
→
b
2
are coplanar if ?
(
a
)
→
a
1
×
→
a
2
=
0
(
b
)
→
b
1
×
→
b
2
=
0
(
c
)
(
→
a
1
−
→
a
2
)
×
(
→
b
1
−
→
b
2
)
=
0
(
d
)
[
→
a
1
→
b
1
→
b
2
]
=
[
→
a
2
→
b
1
→
b
2
]
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