Which of the following statements are always true for vector

Which of the following statements are always true for vectors in R^3? If u (v times w) = 4 then w (v times u) = -4 (7u + v) x (u - 4v) = -27 (u times v) If u is orthogonal to v and w then u is also orthogonal to ||w|| v + ||v|| w (iii) only (i) only (ii) only all of them (i) and (ii) only (ii) and (iii) only (G) none of them (i) and (iii) only

Solution

only true i and (iii)

ans:H