Question

Write $\mathrm{B}=\left\{\mathrm{April},\mathrm{June},\mathrm{September},\mathrm{November}\right\}$ in set builder form.

Answer 1

In set-builder form, we will write a common statement which will be followed by each element of the given set.

In this given set all months having $30$ days are listed.

So, the required set builder form will be $\mathrm{B}=\left\{\mathrm{x}|\mathrm{x}\mathrm{is}\mathrm{a}\mathrm{month}\mathrm{having}30\mathrm{days}\right\}$.