Introduction To Sets

Individual Objects in a set are called

• element

• set

• list

• None of above

A group or collection of objects is called

• element

• set

• list

• group

The set {x: x is an odd number between 10 and 18}

• {11, 12, 13, 15, 17}

• {12, 16, 15, 13}

• {11, 13, 15, 17}

• {12, 14, 16, 18}

Which of the following sets is a universal set for the other four sets?

• The set of even natural numbers

• The set of odd natural numbers

• The set of natural numbers

• The set of negative numbers

• The set of integers

Which of the following are sets?

• The collection of all the days in a week beginning with the letter ‘T’.

• The collection of all difficult questions in the chapter on sets.

• The collection of all beautiful flowers in the park.

• The collection of all active teachers in the school.

• The collection of all integers more than -3.

Which are two sets A and B equal? (select all the correct options)

• A = {x : x is a letter in the word SEAT}

  
  

  B = {x : x is a letter in the word TASTE}

• A = {2, 6, 10, 14}

  
  

  B = {6, 2, 14, 16}

• A = {1, 3, 5, 7, 9}

  
  

  B = {x : x is a positive odd integer x ≤ 9}

• A = {0}

  
  

  B = {x : x > 15 and x < 5}

If two sets are equal, they are also equivalent.

• True

• False

{0} represents a null set.

• True

• False

10 ∉ set of multiples of 5.

• True

• False

In a class of 80 students, there are 60 students who play rugby and 35 who play tennis. What number would go in the coloured section of this diagram, if it is known all students play either rugby, tennis or both these games?

• 95

• 80

• 15