I was asked to simplify the following expression:

$\displaystyle \epsilon_{ijk}\epsilon_{ijk}$

and my simplification went as follows..

$\displaystyle \epsilon_{ijk}\epsilon_{ijk} = \epsilon_{jki}\epsilon_{ijk} = \delta_{jj}\delta_{kk} - (\delta_{jk})^2 = (3)(3) - (3)^2 = 0$

But my book gives an answer of

$\displaystyle \epsilon_{ijk}\epsilon_{ijk} = 2\delta_{kk} = 2(3) = 6$

Where did I go wrong?