There are 15 balls numbered 1 to 15, in a bag. If a person selects one at random, what is the probability that the number printed on the ball will be a prime number greater than 5?
3/5
1/5
11/5
2/5
Explanation:
The primes between 5 and 15 are: 7,11,13.
So the probability $\dfrac{3}{15}=\dfrac{1}{5}$