Answer:
im sure that there are choices in this problem but it seems that the choices are not here,so i will just (sit jk haha) explain what is a well-defined set.
explanation:
in mathematics, providing definition is very important.it has to be concise and objective.
examples for well-defined;
1.set of real numbers
2.set of even numbers
3.set of colors in the crayon box.
for example ,the set of all nice things is not considered as well-defined since being nice is subjective.it may be nice for someone or it may not be nice for some.
Step-by-step explanation:
#share your knowledge
