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A vector perpendicular to the plane cont...

A vector perpendicular to the plane contianing the points `A(1,-1,2), B(2 , 0, -1), C(0, 2, 1)` is

A

8i+4j+4k

B

4i+8j-4k

C

i+j-k

D

3i+j+2k

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The correct Answer is:
A
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