For what value of does the angle between the vectors and become ?

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

For what value of kk does the angle between the vectors ⟨k, 1, −1⟩\langle k,\,1,\,-1\rangle and ⟨1, k, −1⟩\langle 1,\,k,\,-1\rangle become 120∘120^\circ? (a) 00 (b) −2-2 (c) −4-4 (d) 22

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