What is the probability of selecting a prime number out of the following set?

{2, 6, 9, 17, 21, 47, 63, 71, 81}

What is the probability of selecting a prime number out of the following set?

{2, 6, 9, 17, 21, 47, 63, 71, 81}

How many prime numbers are between 40 and 60?

How many prime numbers are between 40 and 60?

How many integers between 2 and 61 are prime numbers, inclusive?

Which of the following sets of numbers contain all prime numbers?

Which of the following sets of numbers contain all prime numbers?

How many integers between 2 and 61 are prime numbers, inclusive?

How many prime numbers between 20 and 40 are divisible by 9?

How many prime numbers between 20 and 40 are divisible by 9?