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Let bar(a)=-bar(i)-bar(k),bar(b)=-bar(i)...

Let `bar(a)=-bar(i)-bar(k),bar(b)=-bar(i)+bar(j)` and `bar(c)=bar(i)+2bar(j)+3bar(k)` be three given vectors. If `bar(r)`is a vector such that `bar(r) times bar(b)=bar(c) times bar(b)`and `bar(r).bar(a)=0` then `bar(r).bar(b)=`

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