Question

A vector coplanar with the non-collinear vectors a and b is

• A. $\mathbf{a} \times \mathbf{b}$
• B. $l \neq 0,m \neq 0,n \neq 0$
• C. $\mathbf{a}.\mathbf{b}$
• D. None of these

Answer 1

Answer: (B)

$l \neq 0,m \neq 0,n \neq 0$

Answer 2

It is obvious.