As an example, $$42$$ is divisible by $$6$$ and by $$14$$ but not by $$12$$. 
A whole number divisible by $$6$$ and by $$14$$ need \emph{not} be divisible by． 

1: $$21$$ 
2: $$12$$ 
3: $$7$$ 
4: $$3$$ 