(a⋅b)c=⟨−11,−11,11⟩; (a⋅c)b=⟨−20,−35,5⟩(\bold{a}\cdot\bold{b})\bold{c} = \lang −11,−11,11\rang;\; (\bold{a}\cdot\bold{c})\bold{b} =\lang −20,−35,5\rang(a⋅b)c=⟨−11,−11,11⟩;(a⋅c)b=⟨−20,−35,5⟩