$$
\begin{array}{r r@{}c@{}l}
& 1 &.& 11111111\ldots \\
& 0 &.& 11111111\ldots \\
& 0 &.& 01111111\ldots \\
& 0 &.& 00111111\ldots \\
& 0 &.& 00011111\ldots \\
& 0 &.& 00001111\ldots \\
& 0 &.& 00000111\ldots \\
+ &&\vdots \\ \hline &&& ~~~?
\end{array}
$$
\(\begin{array}{r r@{}c@{}l} & 1 &.& 11111111\ldots \\ & 0 &.& 11111111\ldots \\ & 0 &.& 01111111\ldots \\ & 0 &.& 00111111\ldots \\ & 0 &.& 00011111\ldots \\ & 0 &.& 00001111\ldots \\ & 0 &.& 00000111\ldots \\ + &&\vdots \\ \hline &&& ~~~? \end{array}\)
