If a, b, c are unit vectors such that \[\mathbf{a}+\mathbf{b}+\mathbf{c}=\mathbf{0},\] then \[\mathbf{a}\,\,.\,\,\mathbf{b}+\mathbf{b}\,\,.\,\,\mathbf{c}+\mathbf{c}\,\,.\,\,\mathbf{a}=\] [MP PET 1988; Karnataka CET 2000; UPSEAT 2003, 04]

If a, b, c are unit vectors such that \[\mathbf{a}+\mathbf{b}+\mathbf{

1.	If a, b, c are unit vectors such that \[\mathbf{a}+\mathbf{b}+\mathbf{c}=\mathbf{0},\] then \[\mathbf{a}\,\,.\,\,\mathbf{b}+\mathbf{b}\,\,.\,\,\mathbf{c}+\mathbf{c}\,\,.\,\,\mathbf{a}=\] [MP PET 1988; Karnataka CET 2000; UPSEAT 2003, 04]
A.	1
B.	3
C.	? 3/2
D.	3/2
Answer» D. 3/2

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If a, b, c are unit vectors such that \[\mathbf{a}+\mathbf{b}+\mathbf{c}=\mathbf{0},\] then \[\mathbf{a}\,\,.\,\,\mathbf{b}+\mathbf{b}\,\,.\,\,\mathbf{c}+\mathbf{c}\,\,.\,\,\mathbf{a}=\] [MP PET 1988; Karnataka CET 2000; UPSEAT 2003, 04]

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