Gọi số cần tìm là $A$
Ta có:
$A\equiv1$ (mod $3$) $\Rightarrow A+893\equiv 0$ (mod $3$)
$A\equiv2$ (mod $5$) $\Rightarrow A+893\equiv 0$ (mod $5$)
$A\equiv3$ (mod $7$) $\Rightarrow A+893\equiv 0$ (mod $7$)
$A\equiv9$ (mod $11$) $\Rightarrow A+893\equiv 0$ (mod $11$)
$\Rightarrow A+893\equiv 0$ (mod $1155$)
mà $A<1000 \Rightarrow A=262$