1.

Describe the following sets in Roster form: {x:x is a letter before e in the English alphabet}.

Answer»

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}.



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