Question

how to write this set in roster form-{months of a year whose names begin with a vowel}

Answer 1

$$\begin{gathered} \mathrm{The}\mathrm{vowels}\mathrm{are}\mathrm{the}\mathrm{letters}:\mathbf{a}\mathbf{,}\mathbf{}\mathbf{e}\mathbf{,}\mathbf{}\mathbf{i}\mathbf{,}\mathbf{}\mathbf{o}\mathbf{,}\mathbf{}\mathbf{u} \\ \mathrm{The}\mathrm{months}\mathrm{whose}\mathrm{name}\mathrm{begins}\mathrm{with}\mathrm{any}\mathrm{of}\mathrm{the}\mathrm{above}\mathrm{letter}\mathrm{are}: \\ \mathrm{April},\mathrm{August},\mathrm{October} \\ \mathrm{To}\mathrm{write}\mathrm{the}\mathrm{set}\mathrm{in}\mathrm{roaster}\mathrm{form},\mathrm{write}\mathrm{this}\mathrm{month}\mathrm{name}\mathrm{under}\mathrm{curly}\mathrm{bracket} \\ \mathrm{seperated}\mathrm{by}\mathrm{comma}. \\ \mathrm{The}\mathrm{required}\mathrm{set}\mathrm{in}\mathrm{roaster}\mathrm{form}\mathrm{is} \\ \left\{\mathbf{}\mathbf{April}\mathbf{,}\mathbf{}\mathbf{August}\mathbf{,}\mathbf{}\mathbf{October}\mathbf{}\right\} \end{gathered}$$