Question

Let a b, and c be three non-zero non-coplanar vectors. Let the position vectors of four points A, B, C and D be $a-b+c$, $λa-3b+4c$, $-a+2b-3c$ and $2a-4b+6c$ respectively. If AB AC , and AD are coplanar, then λ is equal to ____.

Answer 1

The correct answer is 2