Question

If vector u = vector((a x (b x c)) + (b x (c x a)) + (c x (a x b))), then ...

(a) vector u is a unit vector 

(b) vector u = vector(a + b + c) 

(c) vector u = 0 vector 

(d) vector u ≠ 0 vector 

Answer 1

(c) vector u = 0 vector