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If bar(a)= 2bar(i) + 4 bar(j) - 5 bar(k)...

If `bar(a)= 2bar(i) + 4 bar(j) - 5 bar(k), bar(b)= bar(i) +3 bar(j) + bar(k), bar(c )= 2bar(J) + 2 bar(k)`, find the unit vector in the opposite direction of `bar(a) + bar(b) + bar(c )`.

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