Example
To win a lottery prize, you need to correctly choose a set of 6 numbers
between 1 and 40 (inclusive). What is the probability of winning?
The sample space is C(40,6) = 40!/(34!6!) = 3,838,380.
The event is a one-element set.
So, the probability to win is 1/ 3,838,380 = 0.00000026.