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Let bar(a)=4bar(i)+5bar(j)-bar(k),bar(b)...

Let `bar(a)=4bar(i)+5bar(j)-bar(k),bar(b)-bar(i)-4bar(j)+5bar(k)andbar(c)=3bar(i)+bar(j)-bar(k)` . Find the vector which is perpendicular to both `bar(a)andbar(b)andbar(alpha).bar(c)=21`

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The correct Answer is:
α=7i-7j-7k
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