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Omni-MATH / There are four people in a room. For every two people, there is a 50% chance that they are friends. Two people are connected if they are friends, or a third person is friends with …

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problem

There are four people in a room. For every two people, there is a 50%50 \% chance that they are friends. Two people are connected if they are friends, or a third person is friends with both of them, or they have different friends who are friends of each other. What is the probability that every pair of people in this room is connected?
Plain-text mathematical notation (without MathML)
There are four people in a room. For every two people, there is a 50% chance that they are friends. Two people are connected if they are friends, or a third person is friends with both of them, or they have different friends who are friends of each other. What is the probability that every pair of people in this room is connected?
Original LaTeX notation
There are four people in a room. For every two people, there is a $50 \%$ chance that they are friends. Two people are connected if they are friends, or a third person is friends with both of them, or they have different friends who are friends of each other. What is the probability that every pair of people in this room is connected?

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