A. In short, Predicted is an estimate of how many users have satisfied your cohort criteria in the last 30 days, while Live is the number of unique users who have entered the cohort in the last 30 days.  While most of the time the numbers will agree with each other, in some specific cases, differences in numbers between these can arise as the logic between them differs.

You can read more about Predicted and Live Audiences here.

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