Question: In each part, something is wrong with the expression. What? (a) u (v w) (b) (u v) + w (c) ||u

In each part, something is wrong with the expression. What?
(a) u ∙ (v ∙ w)
(b) (u ∙ v) + w
(c) ||u ∙ v||
(d) k ∙ (u + w)

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