Question

Let vector α = ai + bj + ck, β = bi + cj + ak and γ = ci + aj + bk be three coplanar vectors with a ≠ b and vector v = i + j + k. Then v is perpendicular to

(A) α

(B) β

(C) γ

(D) None of these 

Answer 1

Answer is  (A), (B), (C)

Given vectors are coplanar, so