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The angle between two adjacent sides vec...

The angle between two adjacent sides `vec(a)andvec(b)` of parallelogram is `(pi)/(6)`.If `vec(a)=(2,-2,1)and|vec(b)|=2|vec(a)|`,then area of this parallelogram is .......

A

9

B

18

C

`(9)/(2)`

D

`(3)/(4)`

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The correct Answer is:
A
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