Question

Describe the following sets in Roster form: 

{x:x is a letter before e in the English alphabet}.

Answer 1

Here x:x it is read as x is such that x 

So now when we read whole sentence it becomes x is such that x is a letter before e in the English alphabet. Now letters before e are a,b,c,d. 

∴ Roster form will be {a,b,c,d}.