If you're only picking one thing in a probability question, then the actual numbers don't matter - you just need a ratio. For example, if you pick one person from a group, and the ratio of women to men in the group is 2 to 1, then the probability you pick a man is 1/3.
But as soon as you pick two or more things without replacement from a group, then your numbers will matter. Again, if the ratio of women to men is 2 to 1, and you pick two people without replacement, and want to know the probability
...
But as soon as you pick two or more things without replacement from a group, then your numbers will matter. Again, if the ratio of women to men is 2 to 1, and you pick two people without replacement, and want to know the probability
...
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