\[a,\,b,\,c\] are three vectors, such that \[a+b+c=0\], \[|a|\,=1,\,|b|\,=2,\,|c|\,=3\], then \[a.b+b.c+c.a\] is equal to [AIEEE 2003]

\[a,\,b,\,c\] are three vectors, such that \[a+b+c=0\], \[|a|\,=1,\,|b

1.	\[a,\,b,\,c\] are three vectors, such that \[a+b+c=0\], \[\|a\|\,=1,\,\|b\|\,=2,\,\|c\|\,=3\], then \[a.b+b.c+c.a\] is equal to [AIEEE 2003]
A.	0
B.	? 7
C.	7
D.	1
Answer» C. 7

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\[a,\,b,\,c\] are three vectors, such that \[a+b+c=0\], \[|a|\,=1,\,|b|\,=2,\,|c|\,=3\], then \[a.b+b.c+c.a\] is equal to [AIEEE 2003]

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