Let U be universal set of all the students of Class XI of a coeducational school and A be the set of all girls in Class XI. Find A′.

Let X = {Ram, Geeta, Akbar} be the set of students of Class XI, who are in school hockey team. Let Y = {Geeta, David, Ashok} be the set of students from Class XI who are in the school football team. Find X ∪ Y and interpret the set.

Let A be the set of all 50 students of Class X in a school Let f: A to N be function defined by f(x) = roll number of the student x. Show that f in one-one but not onto.

Write down all the subsets of the set : {a, b}

Panchayat has sent flower saplings to the student’s of class VI of Jodunath Vidya Mandir, for their school garden. It was found that if the saplings can be put in rows of 20, 24 and 30, then the number of saplings in each row will be equal. Let’s find the minimum number of saplings that Panchayat sent to School.

List all the subsets of the set { –1, 0, 1 } .

Let A be the set of all students of a boys school. Show that the relation R in A given by R = {(a,b):a is sister of b} is the empty relation and R' ={(a,b): the difference between heights of a and b is less than 3 meters } is the universal relation.

The donations given to an orphanage home by the students of different classes of a secondary school are given below. Find the mean, median and mode of the data.

A haploid set of all the genes present in a gamete is called

A haploid set of all the genes present in a gamete is called

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′?