How many integers between 10 and 20 are prime numbers?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4
Recall that a prime number is an integer greater than 1 whose only divisors are 1 and itself. The prime numbers between 10 and 20 are: 11,13,17, and 19 .

Thus, there are 4 integers between 10 and 20 which are prime numbers.

ANSWER: (E)