Explore topic-wise MCQs in Discrete Mathematics.

This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Discrete Mathematics knowledge and support exam preparation. Choose a topic below to get started.

1.

The lcm of two prime numbers a and b is _________

A. a⁄b
B. ab
C. a + b
D. 1
Answer» C. a + b
Discussion
2.

LCM(a, b) is equals to _________

A. ab/(GCD(a, b))b) (a+b)/(GCD(a, b))c) (GCD(a,
B. is equals to _________a) ab/(GCD(a, b))b) (a+b)/(GCD(a, b))
C. (GCD(a, b))/ab
D. none of the mentioned
Answer» B. is equals to _________a) ab/(GCD(a, b))b) (a+b)/(GCD(a, b))
Discussion
3.

State whether the given statement is True or False. LCM (a, b, c, d) = LCM(a,(LCM(b,(LCM(c, d)))).

A. True
B. False
C.
Answer» B. False
Discussion
4.

If a number is 22 x 31 x 50 and b is 21 x 31 x 51 then lcm of a, b is?

A. 22 x 31 x 51
B. 22 x 32 x 52
C. 23 x 31 x 50
D. 22 x 32 x 50
Answer» B. 22 x 32 x 52
Discussion
5.

If LCM of two number is 14 and GCD is 1 then the product of two numbers is?

A. 14
B. 15
C. 7
D. 49
Answer» B. 15
Discussion
6.

The product of two numbers are 12 and their Greatest common divisor is 2 then LCM is?

A. 12
B. 2
C. 6
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
7.

LCM of 6, 10 is?

A. 60
B. 30
C. 10
D. 6
Answer» C. 10
Discussion
8.

If a, b are integers such that a > b then lcm(a, b) lies in _________

A. a>lcm(a, b)>bb) a>b>lcm(a, b)c) lcm(a,
B. lies in _________a) a>lcm(a, b)>bb) a>b>lcm(a, b)
C. lcm(a, b)>=a>b
D. none of the mentioned
Answer» D. none of the mentioned
Discussion
9.

The LCM of two number 1, b(integer) are _________

A. b + 2
B. 1
C. b
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
10.

A Least Common Multiple of a, b is defined as __________

A. It is the smallest integer divisible by both a and b
B. It is the greatest integer divisible by both a and b
C. It is the sum of the number a and b
D. None of the mentioned
Answer» B. It is the greatest integer divisible by both a and b
Discussion
11.

LCM(A,_B)_IS_EQUALS_TO_:?$

A. ab/(GCD(a, b))
B. (a+b)/(GCD(a, b))
C. (GCD(a, b))/ab
D. None of the mentioned
Answer» B. (a+b)/(GCD(a, b))
Discussion
12.

The_lcm_of_two_prime_numbers_a_and_b_is:$

A. <sup>a</sup>‚ÅÑ<sub>b</sub>
B. ab
C. a + b
D. 1
Answer» C. a + b
Discussion
13.

If a number is 22 x 31 x 50 and b is 21 x 31 x 51 then lcm of a, b is:

A. 2<sup>2</sup> x 3<sup>1</sup> x 5<sup>1</sup>
B. 2<sup>2</sup> x 3<sup>2</sup> x 5<sup>2</sup>
C. 2<sup>3</sup> x 3<sup>1</sup> x 5<sup>0</sup>
D. 2<sup>2</sup> x 3<sup>2</sup> x 5<sup>0</sup>
Answer» B. 2<sup>2</sup> x 3<sup>2</sup> x 5<sup>2</sup>
Discussion
14.

If LCM of two number is 14 and GCD is 1 then the product of two numbers is :
A. 14
B. 15
C. 7
D. 49
Answer» B. 15
Discussion
15.

The product of two numbers are 12 and there Greatest common divisior is 2 then LCM is:
A. 12
B. 2
C. 6
D. None of the mentioned.
Answer» D. None of the mentioned.
Discussion
16.

LCM of 6, 10 is:
A. 60
B. 30
C. 10
D. 6
Answer» C. 10
Discussion
17.

If a, b are integers such that a > b then lcm(a, b) lies in
A. a>lcm(a, b)>b
B. a>b>lcm(a, b)
C. lcm(a, b)>=a>b
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
18.

The LCM of two number 1, b(integer) are

A. b + 2
B. 1
C. b
D. None of the mentioned
Answer» D. None of the mentioned
Discussion
19.

A Least Common Multiple of a,b is defined as:

A. It is the smallest integer divisible by both a and b
B. It is the greatest integer divisible by both a and b
C. It is the sum of the number a and b
D. None of the mentioned
Answer» B. It is the greatest integer divisible by both a and b
Discussion