Which of the following collection are well defined?
1. All students in a school.
2. All planet in our solar system.

Dear student,

The definition of a set is well defined collection(number is unique value).

1. In a particular school the students are fixed(say 1000 students). Therefore it is a set.

2. The number of planets of our solar system are 8. Hence it is a set.

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1) ALL STUDENTS IN A SCHOOL . THIS SENTENCE IS WELL DEFINED 
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All student in a school is well defined collection because one can diffinetly identify a student that belong to the collection.
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Kya ye shi ans h
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