Question

Write the given set from roster form to set-builder form $A=\left\{101,102,103,\dots ...\right\}$

Answer 1

Set-builder form-

When the elements of the set are not listed but described by a property possessed by all the elements of the set. The numbers in the given set are natural numbers starting from $101\dots ..$ So in set-builder from $A=\{x:x\in Nandx>100\}$.

Hence, set builder form $A=\{x:x\in Nandx>100\}$.