Talk:Probability

From 1d4chan

I don't get the: "P({rolling two 20s})+P({rolling a 20 first and any other number second})+P({rolling any number first and a 20 second})" Wouldn't the second 2 components incorporate the first possibility into them? (Note: I'm not saying it's wrong. The Monty Hall Problem and the Boy or Girl problem has taught me that probability can be really counter intuitive.)--Emerald Claw (talk) 15:38, 5 December 2015 (UTC)