If \[\overset{\to }{\mathop{{{r}_{1}}}}\,,\overset{\to }{\mathop{{{r}_{2}}}}\,,\overset{\to }{\mathop{{{r}_{3}}}}\,\] are the position vectors of three collinear points and scalars m and n exist such that\[\overset{\to }{\mathop{{{r}_{3}}}}\,=m\overset{\to }{\mathop{{{r}_{1}}}}\,+n\overset{\to }{\mathop{{{r}_{2}}}}\,\], then what is the value of (m+n)?

If \[\overset{\to }{\mathop{{{r}_{1}}}}\,,\overset{\to }{\mathop{{{r}_

1.	If \[\overset{\to }{\mathop{{{r}_{1}}}}\,,\overset{\to }{\mathop{{{r}_{2}}}}\,,\overset{\to }{\mathop{{{r}_{3}}}}\,\] are the position vectors of three collinear points and scalars m and n exist such that\[\overset{\to }{\mathop{{{r}_{3}}}}\,=m\overset{\to }{\mathop{{{r}_{1}}}}\,+n\overset{\to }{\mathop{{{r}_{2}}}}\,\], then what is the value of (m+n)?
A.	0
B.	1
C.	-1
D.	2
Answer» C. -1

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