Question

If vectors \( \mathbf{i} + \mathbf{j} + \mathbf{k} \) and \( \mathbf{i} + \mathbf{j} + \mathbf{k} \) are coplanar, then find

• A. \( 0 \)
• B. \( 1 \)
• C. \( -1 \)
• D. \( 2 \)

Hint:

To check if two vectors are coplanar, use the determinant method or vector cross products.

Answer 1

The Correct Option is C

For two vectors to be coplanar, the determinant of the matrix formed by them must be zero.
Final Answer: \[ \boxed{-1} \]