You probably all know what Russian roulette is.
Also I believe you do know what Black jack is as well.

So what do these games have in common?
The chance of winning- or should I say surviving.

When u play Russian roulette , you have a 1/6 in firing a bullet. IF you don't fire it and don't reset the wheel it becomes a 1/5 chance. (meaning that if u fire 5 shots, 1 of them is 100% going to fire for real).

Now if you do reset it- it's still 1/6 chance.

Theres the same concept when it comes to Black jack.
The cards- when used are moved out of the deck, meaning you have more % to get higher/lower cards)

Good luck.