KEAM 2016 Math Paper

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Question : 69 of 120
 
Marks: +1, -0
Let
→
a
=2
⋀
i
+5
⋀
j
−7
⋀
k
,
→
b
=
⋀
i
+3
⋀
j
+5
⋀
k
.
Then (3
→
a
−5
→
b
)
(4
→
a
×5
→
b
)
=
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