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JEEMAIN-2014
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Q)
If
A
=
[
1
2
x
3
−
1
2
]
and
B
=
[
y
x
1
]
be such that
A
B
=
[
6
8
]
, then :
(
a
)
y
=
2
x
(
b
)
y
=
−
2
x
(
c
)
y
=
x
(
d
)
y
=
−
x
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