If \( a, b, c \) are position vector of vertices of a triangle
\( \...
If \( a, b, c \) are position vector of vertices of a triangle
\( \mathrm{P} \) \( \mathrm{ABC} \), then unit vector perpendicular to its plane is:
W
(1) \( a \times b+b \times c+c \times a \)
(2) \( \frac{a \times b+b \times c+c \times a}{|a \times b+b \times c+c \times a|} \)
(3) \( \frac{a \times b}{|a \times b|} \)
(4) None of these
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