If \[|\mathbf{a}|\,\,=3,\,\,\,|\mathbf{b}|\,\,=1,\,\,|\mathbf{c}|\,\,=4\] and \[\mathbf{a}+\mathbf{b}+\mathbf{c}=\mathbf{0},\] then \[\mathbf{a}\,.\,\mathbf{b}+\mathbf{b}\,.\,\mathbf{c}+\mathbf{c}\,.\,\mathbf{a}=\] [MP PET 1995; RPET 2000]

If \[|\mathbf{a}|\,\,=3,\,\,\,|\mathbf{b}|\,\,=1,\,\,|\mathbf{c}|\,\,=

1.	If \[\|\mathbf{a}\|\,\,=3,\,\,\,\|\mathbf{b}\|\,\,=1,\,\,\|\mathbf{c}\|\,\,=4\] and \[\mathbf{a}+\mathbf{b}+\mathbf{c}=\mathbf{0},\] then \[\mathbf{a}\,.\,\mathbf{b}+\mathbf{b}\,.\,\mathbf{c}+\mathbf{c}\,.\,\mathbf{a}=\] [MP PET 1995; RPET 2000]
A.	? 13
B.	? 10
C.	13
D.	10
Answer» B. ? 10

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If \[|\mathbf{a}|\,\,=3,\,\,\,|\mathbf{b}|\,\,=1,\,\,|\mathbf{c}|\,\,=4\] and \[\mathbf{a}+\mathbf{b}+\mathbf{c}=\mathbf{0},\] then \[\mathbf{a}\,.\,\mathbf{b}+\mathbf{b}\,.\,\mathbf{c}+\mathbf{c}\,.\,\mathbf{a}=\] [MP PET 1995; RPET 2000]

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