Chariot of Fire wrote:The 7 cards have to comprise 5 of one colour and 2 of another colour.
1st card - can be any. 1:1
2nd card - can be any. 1:1
3rd card - must be one of 1st or 2nd. 2:3
4th card - must be one of 1st or 2nd. 2:3
5th card - must be one of 1st or 2nd. 2:3
6th card - must be the same as whatever one holds 3 of. 1:3
7th card - must be the same as whatever one holds 4 of. 1:3
T/fore 1 x 1 x .67 x .67 x .67 x .33 x .33 = .0328 (a 3.28% chance of getting landed with this combo).
So Denise had a 3% chance of getting stung like that, followed by red having a 22% chance of a 3 card set. So the combination of these two events is a very improbable 0.7% (or roughly 1 chance in 140).
Poor Denise. It's written in the cards, as the saying goes.
So you're saying a 7 card fail happens 1 in 33 times,
I always just "ballpark estimated" that it was the same as a runner-runner flush, which is what? about 1 in 25? (4%)
The key to it happening is missing one color completely, and not having more than 2 of a color... all other combos work.
So what i don't like about your formula is this (let's assume the missing color is Yellow)
1st 2 cards can RB, RR, BB
so 3rd card, if not yellow, makes a set.
So how 'bout this:
1st card doesn't matter
2nd card has 1 in 3 chance to be missing color
3rd through 7 same 1 in 3 chance... we are now at 9%
Then add back in the chance of 2 sets with just 2 colors
The 1st 5 cards don't matter...
From there, 1 in 4 chance of not hitting the 2nd set
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So that would be 2 1/4%
Yikes... that's 1 in 44
Worse odds than either of us thought...
Oh, the other number that looks off... wouldn't RED have a
33% chance of a 3 card set (1 in 3) (not 22%)