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Math Help - [SOLVED] How can I tell if two or three vectors are parallel?

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    [SOLVED] How can I tell if two or three vectors are parallel?

    How can I tell if two or three vectors are parallel?

    Say vectors

    (1,2,-2) and (2,4,-4) are they parallel because they are proportionate?

    Edit: Solved.
    Last edited by thekrown; March 6th 2010 at 05:58 AM.
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