KEAM 2016 Math Paper

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Question : 66 of 120
 
Marks: +1, -0
The angle between
→
a
‌and
‌
→
b
is 5π/6 and the projection of
→
a
‌and
‌
→
b
‌is
-
9
√3
‌then
|
→
a
|
is equal to
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