Find $| a × b |$, if $a = \hat i - 7\hat j + 7\hat k$ and $b = 3\hat i - 2\hat j + 2\hat k$

Question

$\begin{array}{1 1} \sqrt {405} \\ 38 \\ 2 \sqrt{19} \\ 19 \sqrt 2 \end{array}$