KöMaL 2026 B5552

How many quadruples $(a,b,c,d)$ are there such that $a-b+c-d$ is divisible by $1893$, where $a$, $b$, $c$, $d \in \{1,2,3,\ldots ,1893\}$ and $a$, $b$, $c$ and $d$ are distinct from each other?