$\begin{array}{1 1} (a)\:(\large\frac{17}{56}.\frac{17}{43},\frac{17}{111})\:\qquad\:(b)\:(\large\frac{56}{17}.\frac{43}{17},-\frac{111}{17})\:\qquad\:(c)\:(-2,-1,3)\:\:\qquad\:(d)\:(-\large\frac{53}{17},\frac{43}{17},\frac{111}{17}) \end{array} $