Question

The line vector r = a x λb will not meet the plane r x n = q, provided

(A) b x n = 0, a.n = q

(B) b x n ≠ 0, a.n = q

(C) b x n = 0, a.n ≠ q

(D) b x n ≠ 0, a.n = q

Answer 1

Answer is (C) b x n = 0, a.n ≠ q

We must have b x n = 0 and a.n ≠ q.