Find the domain and range of $R$.

Question:

Let $R=\{(a, b): a, b \in N$ and $a+3 b=12\}$

Find the domain and range of $R$.

 

Solution:

$\operatorname{dom}(R)=\{3,6,9\}$ and range $(R)=\{3,2,1\}$

 

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