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Show that the vectors bar(a) = 2 hat(i) ...

Show that the vectors `bar(a) = 2 hat(i) - 3 hat(j) + 4 hat(k) and bar(b) = -4 hat(i) + 6 hat(j) - 8k` are collinear.

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The correct Answer is:
`bar(b) = -2 hat(a)`
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