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Let A, B, C, D be four points with posit...

Let A, B, C, D be four points with position vectors `bar(a)+2bar(b), 2bar(a)-bar(b), bar(a) and 3bar(a)+bar(b)` respectively. Express the vectors `bar(AC), bar(DA), bar(BA) and bar(BC)` interms of `bar(a) and bar(b)`.

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