I have $2$ formulas (mentioned in this page): http://www.vttoth.com/digimix.htm
- $Z = 2AB$ if both $A<0.5$ and $B<0.5$
- $Z = 2(A+B) – 2AB – 1$ otherwise
where $A$ and $B$ are numbers between $0$ and $1$ (including $0$ and $1$) eg: $0$ $0.2$ $0.9$ $0.34$ $1$
Now, I can understand formula $1$ (if $A$ and $B$ are BOTH greater than $0.5$, then $Z$ is $2AB$, right?) What I can't understand is the part from the second formula that reads $2(A+B)$:
Add $A$ with $B$ and then multiply by $2$ : $2\cdot(A+B)$ is this correct or am I missing something?