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Published online by Cambridge University Press: 20 November 2018
Let $\mathcal{A}$ and
$\mathcal{B}$ be large subsets of
$\{1,\,.\,.\,.\,,\,N\}$. We study the number of pairs
$\left( a,b \right)\,\in \,\mathcal{A}\,\times \,\mathcal{B}$ such that the sum of binary digits of
$a\,+\,b$ is fixed.