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Find the value of lambda if three vector...

Find the value of `lambda` if three vectors `veca= 2hati-hatj+hatk,vecb= hati+2hatj-3hatk` and `vecc= 3hati+lambdaj+5hatk` are coplanar.

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If the vectors vec a=2hati-hatj+hatk, vec b=hati+mhatj-3hatk and vec c =3hati-4hatj+5hatk are coplanar, then find m.

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