Which of the following collections are sets?
All the good boys of our neighborhood

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Solution

As we know that a set is a collection of well-defined object $.$
The given statement $'$ All the good boys of our neighbourhood $'$ is not well defined $.$
There is no other condition given on which we can decide good boys $.$
Hence $,$ the statement $'$ All the good boys of our neighbourhood $'$ is not a collection of set

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