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1 .

3 people are in 3 separate rooms. Inside each person's room there is a button. If no one presses any buttons, they all get nothing. If 1 person presses his/her button, that person wins a bag full of cash. If 2 people press their buttons, the person who did not press his/her button wins a bag full of cash. If all 3 people their buttons, they all get nothing. Imagine you're one of these 3 people, and you want to win the money prize. Will you press your button? Don't calculate the probabilities. Just go with your gut feeling. This is a psychology/behavior study, not a math test.