is a factor of $$1\times2\times3\times4\times5\times6\times7\times8\times9\times10$$. 
Overseas Competition->Knowledge Point->Calculation Modules->Whole Numbers->Whole Numbers Multiplication and Division
$$1\times2\times3\times4\times5\times6\times7\times8\times9\times10$$ is divisible by $$3$$ and $$25$$. 