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The vectors 3hati - hatj +2hatk, 2hati+h...

The vectors `3hati - hatj +2hatk, 2hati+hatj+3hatk` and `hati+lambdahatj-hatk` are coplanar if value of `lambda` is
(A) -2
(B) 0
(C) 2
(D) any real number

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