(a) if you deal thousands of poker hands, the fraction of them that contain three of a kind will be very close to 1/50.
(b) if you deal 50 poker hands, exactly 1 of them will contain three of a kind.
(c) if you deal 10,000 poker hands, exactly 200 of them will contain three of a kind.
(a) S = any number between 0 and 1.
(b) S = whole numbers 0 to 8.
(c) S = all sequences of 8 hits or misses, like HMMHHHMH.