This set of Discrete Mathematics Multiple Choice Questions & Answers (MCQs) focuses on “Prime Numbers”.

1. The number of factors of a prime numbers are:

a) 2

b) 3

c) Depends on the prime number

d) None of the mentioned

View Answer

Explanation: A prime number is only divisible by 1 and itself.

2. The number ‘ 1’ is :

a) Prime number

b) Composite number

c) Neither Prime nor Composite

d) None of the mentioned

View Answer

Explanation: 1 is neither prime number nor composite.

3. State whether True or False

All prime numbers are odd.

a) True

b) False

View Answer

Explanation: 2 is even as well as prime.

4. State whether True or False

3 is the smallest prime number possible.

a) True

b) False

View Answer

Explanation: 2 is also a prime number.

5. How may prime numbers are there between 1 to 20.

a) 5

b) 6

c) 7

4) None of the mentioned

View Answer

Explanation: The prime numbers between 1 to 20 are 2, 3, 5, 7, 11, 13, 17, 19.

6. State whether the given statement is true or false

There are finite number of prime numbers.

a) True

b) False

View Answer

Explanation: There are infinite numbers of primes.

7. Sum of two different prime number is a:

a) Prime number

b) Composite number

c) Either Prime or Composite

d) None of the mentioned

View Answer

Explanation: Eg:- 2 + 3 = 5 a prime, 3 + 7 = 10 a composite.

8. Difference of two distinct prime numbers is ?

a) Odd and prime

b) Even and composite

c) None of the mentioned

d) All of the mentioned

View Answer

Explanation: 3 – 2 = 1 is neither prime nor composite.

9. If a, b, c, d are distinct prime numbers with a as smallest prime then a * b * c * d is a:

a) Odd number

b) Even number

c) Prime number

d) None of the mentioned.

View Answer

Explanation: Since a is 2, 2 * b * c * d = Even number.

10. If a, b are two distinct prime number than highest common factor of a, b is

a) 2

b) 0

c) 1

d) ab

View Answer

Explanation: HCF of two prime numbers is 1.

**Sanfoundry Global Education & Learning Series – Discrete Mathematics.**

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