a coin is tossed three times. write the event a of getting at least two heads and event B of getting no head. write events A and B. also write the number of sample points.
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probability of event A = 4/8 (hth,hht,thh,hhh =1/2
probability of event B = 1/8 (ttt)
probability of event B = 1/8 (ttt)
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