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

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

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