This question was answered by Paul Davies who claimed it would take trillions and trillions of universes to get just one like ours.Let's take the billiard ball thing. I have a bag containing 100 balls. If I pick one ball out of the bag, what is the probability that it will be red?
To determine the probability, I need to know (a) that there is a bag, that is a limit to the number of instances of the ball; I need to know how many balls are in the bag; and I need to know how many of those balls are red; and I need to know the selection methodology.
If the answers are certainly (a) there is a bag; (b) there are 100 balls therein; (c) there is only one red ball within; and (c) the selection is purely random .... then I can say the probability is 1 in 100.
As to the universe: is there a limit to the number of universes? If so, what is it? How many universes within that "bag" are there which match ours? How do we decide which universe to select for our hypothetical experiment? What then is the likelihood that it will match ours?
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