Question

Which of the following natural numbers are prime numbers?

• A. $37$
• B. $77$
• C. $103$
• D. $231$

Answer 1

Answer: (A), (C)

$103$

The natural numbers which is divisible by $1$ and itself are called prime numbers. They do not have factor other than $1$.

In above question, the number $37$ and $103$ are prime numbers because they do not have any other factor except $1$ and itself the number.

Whereas, the number $77$ has the factors $7$ and $11$ along with $1$ and itself, $231$ have factors $3$ and $11$ along with $1$ and itself. Hence, $77\&231$ are not prime.