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If bar(a) = 2bar(i) - bar(j) + bar(k), a...

If `bar(a) = 2bar(i) - bar(j) + bar(k), and bar(b) = bar(i) - 3bar(j) - 5bar(k)` then find `|bar(a) xx bar(b)|`.

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The correct Answer is:
`sqrt(210)`
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