Question

Describe the following set in Roster form:

(iii) $\{x\in N:x$ is a prime number, $10<x<20\}$

Answer 1

$\because x$ is a prime number between 10 and 20 and $x\in N$.

$\therefore$ Prime numbers between 10 and 20 are 11, 13 17, 19.

So, Roster form will be $=\{11,13,17,19\}$.