IIT-JEE Exam

Let a = -ˆi - kˆ , b = -ˆi + j

and c = ˆi + 2ˆj+ 3kˆ
be three given vectors. If r

is a vector such that r ´ b = c´ b

and r × a = 0
, then the value of r × b

is

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