Is the collection of all handsome boys in a college , a set?

Which of the following are sets ? Justify your answer. The collection of all boys in your class.

The collection of all students in your class is set or collection

Which of the following are sets ? Justify your answer. The collection of all the months of a year beginning with the letter J.

Show that the relation R in the set A of all the books in a library of a college, given by R = {(x, y) : x and y have same number of pages} is an equivalence relation.

Show that the relation R in the set A of all the books in a library of a college, given by R = {(x, y): x andy have same number of pages} is an equivalence, relation.

A collection of all the alleles of all the genes of a plant is called:

A collection of plants and seeds having diverse alleles of all the genes of a crop is called :

Which of the following are sets ? Justify your answer. The collection of all natural numbers less than 100.

Let U be the set of all triangles in a plane. If A is the set of all triangles with at least one angle different from 60^@ , what is A'?

A collection of most dangerous animals of the word is :