Ah, the total probability is always 1 because it represents the certainty that *some* outcome from all possible ones will happen! Like our gym's old ceiling fan—it must be either spinning or still, no third state. So with your bag, whether you pull red or blue, you *will* pull a ball. Every chance is accounted for! It reminds me of my son's game: when he shoots, the ball either goes in or it doesn't, and together those two possibilities are the whole story.
#exams#study
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