2015-II-33

Ans: A
$\begin{array}{cl}
& 11 + 2^6 + 2^{10} + 2^{11} \\
= & 1 + 2 + 2^3 + 2^6 + 2^{10} + 2^{11} \\
= & 2^{11} + 2^{10} + 2^6 + 2^3 + 2^1 + 2^0 \\
= & 110\ 001\ 001\ 011_2
\end{array}$