Question

Write the given set in roster form $A=\left\{x|x\in N,x<20.\right\}$

Answer 1

Roster form-

When the elements are represented by listing all its elements (without repetition) separating them by commas and enclosing them within curly brackets. The set $A=\{1,2,3,4........19\}$.

Hence,roster form is $A=\{1,2,3,4........19\}$.