Practice Discrete Mathematics Interview Multiple Choice Questions with Answers Quiz-1

Q.1.

Let the set A is { and B is {4}. Then the number of elements in A U B is?

a) 4
b) 5
c) 6
d) 7

Explanation

Q.2.

Let the set A is { and B is {4}. Then number of elements in A ∩ B is?

a) 1
b) 2
c) 3
d) 4

Explanation

Q.3.

Let the set A is { and B is {4}. Then the set A – B is?

a) {1, -4}
b) {1, 2, 3}
c) {1}
d) {2, 3}

Explanation

Q.4.

In which of the following sets A – B is equal to B – A?

a) A = {1, 2, 3}, B = {2, 3, 4}
b) A = {1, 2, 3}, B = {1, 2, 3, 4}
c) A = {1, 2, 3}, B = {2, 3, 1}
d) A = {1, 2, 3, 4, 5, 6}, B = {2, 3, 4, 5, 1}

Explanation

Q.5.

Let A be set of all prime numbers, B be the set of all even prime numbers, C be the set of all odd prime numbers, then which of the following is true?

d) All of the mentioned
a) A ≡ B U C
b) B is a singleton set.
c) A ≡ C U {2}

Explanation

Q.6.

If A has 4 elements B has 8 elements then the minimum and maximum number of elements in A U B are ____________

a) 4, 8
b) 8, 12
c) 4, 12
d) None of the mentioned

Explanation

Q.7.

If A is {{Φ}, {Φ, {Φ}}}, then the power set of A has how many element?

a) 2
b) 4
c) 6
d) 8

Explanation

Q.8.

Two sets A and B contains a and b elements respectively. If power set of A containsmore elements than that of B, value of ‘b’ and ‘a’ are _______

a) 4, 5
b) 6, 7
c) 2, 3
d) None of the mentioned

Explanation

Q.9.

Let A be {4}, U be set of all natural numbers, then U-A’(complement of A) is given by set.

a) {1, 2, 3, 4, 5, 6, ….}
b) {5, 6, 7, 8, 9, ……}
c) {1, 2, 3, 4}
d) All of the mentioned

Explanation

Q.10.

Which sets are not empty?

a) {x: x is a even prime greater than 3}
b) {x : x is a multiple of 2 and is odd}
c) {x: x is an even number and x+3 is even}
d) { x: x is a prime number less than 5 and is odd}

Explanation

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