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Which of the ...

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Which of the following collections are sets?
(a) All the students of your school.
(b) Members of Indian parliament.
(c) The colours of rainbow.
(d) The people of Karnataka having green ration card.
(e) Good teachers in a school.
(f) Honest persons of your village

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Solution

$a, b, c, d$ are collection of sets.
Sets is a well defined collection of objects.

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