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IIT JEE Advanced 2010 Paper 1

Section: Mathematics
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Question : 80 of 84
 
Marks: +1, -0
If
→
a
 and
→
b
 are vectors in space given by
→
a
 =
^
i
−2
^
j
√5
 and
→
b
 =
2
^
i
+
^
j
+3
^
k
√14
 , then he value of
(2
→
a
+
→
b
).[(
→
a
×
→
b
)×(
→
a
−2
→
b
)]
is ____.
[JEE Adv 2010 P1]
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