Question

The number 10 has four factors: 1,2, 5 and 10. The table below lists the number of factors for some numbers

Numbers	Number of factors
$21$	$4$
$23$	$2$
$25$	$3$
$27$	$4$
$29$	$2$

From this, we can say that the number of prime numbers between $20$ and $30$ is:

• A. $0$
• B. $2$
• C. $3$
• D. $4$

Answer 1

Answer: (B)

$2$

We know that prime numbers have two factors that is 1 and number itself.

In the given table only 23 and 29 have 2 factors so there will be two prime numbers that is 23 and 29 so correct answer will be option B