If →a,→b,→c are three non coplanar, non zero vectors and →r is any vector in space, then (→a×→b)×(→r×→c)+(→b×→c)×(→r×→a)+(→c×→a)×(→r×→b) is equal to λ[→a →b →c]. Then the value of λ is

If →a,→b,→c are three non coplanar, non zero vectors and →r is

1.	If →a,→b,→c are three non coplanar, non zero vectors and →r is any vector in space, then (→a×→b)×(→r×→c)+(→b×→c)×(→r×→a)+(→c×→a)×(→r×→b) is equal to λ[→a →b →c]. Then the value of λ is
Answer» If $\to a, \to b, \to c$ are three non coplanar, non zero vectors and $\to r$ is any vector in space, then $(\to a \times \to b) \times (\to r \times \to c) + (\to b \times \to c) \times (\to r \times \to a) + (\to c \times \to a) \times (\to r \times \to b)$ is equal to $λ [\to a \to b \to c]$ . Then the value of $λ$ is