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Give a condition that three vectors ...

Give a condition that three vectors ` vec a , vec b` and ` vec c` from the three sides of a triangle. What are the other possibilities?

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The correct Answer is:
`vec(a)+vec(b)+vec(c )=vec(0)`. Other possibilities are ; `vec(a)=vec(b)+vec(c ), vec(b)=vec(a)+vec(c )` and `vec(c )=vec(a)+vec(b)`.
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