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Assertion: Let vecr=l(vecaxxvecb)+m(vecb...

Assertion: Let `vecr=l(vecaxxvecb)+m(vecbxxvecc)+n(veccxxveca), where l,m,n` are scalars and `[veca vecb vecc]=1/2, then l+m+n=2vecr.(veca+vecb+vecc).` Reason: `veca,vecb,vecc` are coplanar (A) Both A and R are true and R is the correct explanation of A (B) Both A and R are true R is not te correct explanation of A (C) A is true but R is false. (D) A is false but R is true.

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