The vector area of triangle whose two sides are given by $2 \hat {i}-7 \hat {j}+\hat {k} $ and $ 4 \hat j -3 \hat k$ is :

Question

\[(a)\;\frac{17}{4}\;sq.units \quad (b)\;\frac{17}{2} \;sq.units \quad (c)\;17\;sq.units \quad (d)\;none\;of\;these\]