Random numbers from a set. probability?

5 numbers are selected at random from the set



{1,2,3,...,20}



What is the probability that their MINIMUM

(smallest of the 5 picked numbers)



is greater than 5?



Thanks in advanced.
If repetitions are not allowed:

(15 p 5) / (20 p 5) = 0.1937



*Edit*



There are 3 ways to approach the problem, all of which get the same answer. I chose to think of it in terms of fractions:

(15/20)(14/19)(13/18)(12/17)(11/16).

But I wrote it like (15p5)/(20p5) because that