Write the following sets in roster form :

$C = \{ x:x{\rm{ }}$ is a two-digit natural number such that sum of its digits is $8\} $

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$C = \{ x:x{\rm{ }}$ is a two-digit natural number such that the sumof its digits is $8\} $

The elements of this set are $17,26,35,44,53,62,71$ and $80$ only.

Therefore, this set can be written in roster form as $C=\{17,26,35,44,53,62,71,80\}$

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