  In this note we present a complete computation of the topological K-theory of
the reduced C*-algebra of a semidirect product of the form
$\Gamma=\mathbb{Z}^n\rtimes_\rho\mathbb{Z}/2$ with no further assumptions about
of the conjugacy action $\rho$. For this, we use some results for
$\mathbb{Z}/2$-equivariant K-theory proved by Rosenberg and previous results of
Davis and Luck when the conjugacy action $\rho$ is free outside the origin.

K-Theory and Homology