Question

Write the given set in Roster Form:

(a) All prime numbers between $1$ and $20.$

Answer 1

Step: Writing the given set in roster form

Prime numbers between $1$ and $20$ are:​

$2,3,5,7,11,13,17$ and $19.$​

Hence, the roster form of given set is: ​
$\{2,3,5,7,11,13,17,19\}$.