If a, b, c are unit vectors such that a + b + c = 0, then the value of a.b + b.c + c.a is
A. 1
B. 3
C. \(-\frac{3}{2}\)
D. None of these
Answer:C
If a, b, c are unit vectors such that a + b + c = 0, then the value of a.b + b.c + c.a is
A. 1 B. 3 C. \(-\frac{3}{2}\) D. None of these