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Could someone please explain to me in detail how to solve problems like these with this two in a row bullcrap. I really don't get it and it's irking me. They try to explain to you in the game but I think it's explained bad; I still didn't get it. This is a game from Lumosity about basically setting up items in different probabilities. They have simple kind of problems to hard ones like this two in a row bullshit. It's still in its "early access" form, which is basically like it's a beta. This could explain why I keep getting the two in a row problems wrong, in which their correct answers are actually wrong, but I doubt it. It's most likely that I just don't get it. Please help.
>>
t = total objects, g = green / pink
prob of 1st ball = (t-g)/t
prob of 1st, then 2nd ball = (t-g)/t * (t-g-1)/(t-1)
prob of green = g / t
you want: prob of green = prob of 1st then 2nd ball * 4/9
g/t = (t-g)/t * (t-g-1)/(t-1) * 4/9
then just find all combinations of g, t where true
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