Let $X$ be a D17: Finite set such that

(i) | $\mathcal{M} : = \{ 0, 1 \}^X$ is the D68: Set of maps from $X$ to $\{ 0, 1 \}$ |

Then
\begin{equation}
|\mathcal{M}|
= 2^{|X|}
\end{equation}