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If vec(a)=hat(i)+2hat(j)+3hat(k),vec(b)=...

If `vec(a)=hat(i)+2hat(j)+3hat(k),vec(b)=-hat(i)+2hat(j)+hat(k)andvec(c)=3hat(i)+hat(j)" find "lambda" such that "vec(a)+lambdavec(b)` is perpendicular to `vec(c).`

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