3. i 1+a + b=0 and vectors (1, a, a-)(1, b, b) and (1, c, c) are non-coplanar, then the 1+c product abc equals: (a) 2 cb)-1 (c) 1 (d) 0

3. I 1+a + b=0 and vectors (1, a, a-)(1, b, b) and (1, c, c) are non-coplanar, then the 1+c product abc equals: (a) 2 Cb)-1 (c) 1 (d) 0