3, 13, 17, 23 are prime numbers. The others are not.
13
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.
The prime numbers between 10 and 21 are 11, 13, 17, and 19.
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
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.
The prime numbers between 10 and 21 are 11, 13, 17, and 19.
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)