1.

Which of the following collection is not a set ?A. The colours in RAINBOW.B. All good books in a school library.C. The members of your family.D. The principals of your school.

Answer» Correct Answer - B
(a) The collection of colours in a RAINBOW is well-defined. So it is a set.
(b) We cannot say which books are there in our collection. So, it is not a well-defined collection. Hence, it is not a set.
(c) The members of your family is a well-defined collection.
`:.` It is a set.
(d) The collection of principals in your school is a well-defined collection.
`:.` It is a set
Hence, the correct option is (b).


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