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JEEMAIN-2014
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Q)
If
|
→
a
|
2
=
60
and
→
c
×
(
ˆ
i
+
2
ˆ
j
+
5
ˆ
k
)
=
→
0
, then the value of
→
c
.
(
−
7
ˆ
i
+
2
ˆ
j
+
3
ˆ
k
)
is :
(
a
)
4
√
2
(
b
)
12
(
c
)
24
(
d
)
12
√
2
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