Write the relation $R = \{ \left( {x,{x^3}} \right):x$ is a prime number less than $10{\rm{\} }}$ in roster form.
Write the relation $R = \{ \left( {x,{x^3}} \right):x$ is a prime number less than $10{\rm{\} }}$ in roster form.
$R = \{ \left( {x,{x^3}} \right):x$ is a prime number less than $10\} .$ The prime numbers less than $10$ are $2,3,5$ and $7.$
$\therefore R=\{(2,8),(3,27),(5,125),(7,343)\}$
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