3, 13, 17, 23 are prime numbers. The others are not.
13
The prime numbers between 10 and 21 are 11, 13, 17, and 19.
21 is a composite number, as it can be divided by 7 and 3. The other three numbers are prime numbers and do not divide into anything besides themselves.
They are 13 and 19 which are prime numbers
21 is not a prime number because it is 3 x 7
13
17 is a prime number, but 21 is not (21 = 3 * 7).
91 = 13*751 = 17*321 = 3*731 is prime. â–
5, 13 and 17 are prime.
21
The prime numbers between 10 and 21 are 11, 13, 17, and 19.
21 is a composite number, as it can be divided by 7 and 3. The other three numbers are prime numbers and do not divide into anything besides themselves.
They are 13 and 19 which are prime numbers
21 is not a prime number because it is 3 x 7
21 isn't because 7*3=21.
Four. The prime numbers between 10 and 21 are 11, 13, 17, and 19.
From 10 to 30, there are 21 numbers.Six of them are prime numbers: 11, 13, 17, 19, 23, and 29.If you pick a number at random from 10 to 30, the probabilitythat it's a prime number is6/21 = 2/7 = 28.57% (rounded)