Question: This is easier because in any situation, either all three people will respond, or at least one person will not. These are the only two

This is easier because in any situation, either all three people will respond, or at least one person will not. These are the only two possibilities, and they cover all outcomes. So, we calculate the easier one (all respond), and subtract it from 1 to find the other (at least one does not respond). paraphrase it like this prapgraph To calculate the probability of at least one participant not responding (out of three) you find the complementary event P(A') of the probability of all three participants who were chosen and responded P(A)

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