Question

Which of the following collections is a set?

• A. The collection of all the factors of number 56.
• B. The collection of all good dishes in India.
• C. The collection of states in the Indian Union.
• D. The collection of all great prime ministers in India.

Answer 1

Answer: (A), (C)

The collection of states in the Indian Union.

A set is a well-defined collection of distinct objects/elements.
The collection of states in the Indian Union and the collection of all the factors of number 56 are well-defined collections of distinct elements, whereas the other collections are not well-defined as they are based on individual's choices and may vary from person to person. Therefore, they aren't sets.