MCQ

Share

If $\vec a$ and $\vec b$ are perpendicular unit vectors and vector $\vec c$ is such that $\vec c = \vec a + \vec b$ , then $\left( {\vec a \times \vec b} \right).\left( {\vec b \times \vec c} \right) + \left( {\vec b \times \vec c} \right).\left( {\vec c \times \vec a} \right) + \left( {\vec c \times \vec a} \right).\left( {\vec a \times \vec b} \right)$ is

• A
  $0$
• B
  $1$
• ✓
  $-1$
• D
  $\vec b.\vec c + \vec c.\vec a$