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If bar(a)=2bar(i)-3bar(j)+6bar(k),bar(b)...

If `bar(a)=2bar(i)-3bar(j)+6bar(k)`,`bar(b)=-2bar(i)+2bar(j)-bar(k)` and `k`=(the projection of `bar(a)` on `bar(b))`/(the projection of `bar(b)` on `bar(a))` then the value of `3k=`

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