Let U be universal set of all students of class XI of a co-educational school and A be the set of all girls in class XI. Find A’.

The set of weak students in a class is :

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

Let A be the set of all students of class XII in a school and R be the relation, having the same sex on A, and then prove that R is an equivalence relation.

The set of poor students in the class is :

Let A be the set of all 50 students of class XII in a school. Let f: A rarr N be the function defined by : f (x) = Roll number of the student x. Prove that 'f' is one-one but not onto.

The number of girl students in each class of a co-educational middle school is depicted by the pictograph: Observe this pitograph and answer the folllowing questions: Which class has the minimum number of girl students? .

Let X = {Ram, Geeta, Akbar} be the set of students of XI class who are in School Hockey team. Let Y = {Geeta, David, Ashok} be the set of students of XI class who are in School Football team. Find X uu Y and X nn Y and interpret the set.

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.

Consider the marks obtained (out of 100 marks) by 30 students of Class IX of a school: Find the mean of the marks obtained by 30 students of Class IX of a school.