A =  {x : x is a set of even natural numbers between 15 and 45} . now what is the full form of this   :

Hi Srishti!
If the question is “Let A = {x: x is a set of even natural numbers between 15 and 45} .Write this set in roster and descriptive forms.”, then the answer is given below.
 
A = {x: x is a set of even natural numbers between 15 and 45}.
The roster form of this set can be written as:
A = {16, 18 20 22, 24 26, 28, 30, 32, 34, 36, 38, 40, 42, 44}
The descriptive form of this set can be written as:
A = {Even natural number between 15 and 45}
 
Hope! you got the answer.
 
Best wishes!

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