GUJCET 2018 Math Solved Paper

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Question : 30 of 40
 
Marks: +1, -0
If for unit vectors
−
a
‌and
‌
−
b
,
−
a
+2
−
b
‌and
‌5
‌
−
a
‌–
‌4
‌
−
b
are perpendicular to each-other, then (
−
a
^
−
b
)
= ___________
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