identify the sample space of the probability experiment and determine the number of outcomes in the event

experiment: tossing 4 coins

event: getting 3 heads
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Getting three heads

P(getting three heads) = P(E1) = Number of times three heads appeared/Total number of trials number of times three heads appeared= HHHT, HHTH, HTHH ,THHH = 4

Total number of outcomes =2^4 = 16

Hence the probability of getting three heads= 4/16=1/4


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