Question 889958
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There are 2 possible outcomes on each toss, so the number of sequences of outcomes on three tosses is 2*2*2 = 8.<br>
Of those 8 possible sequences, 3 of them have exactly 2 heads: HHT, HTH and THH.<br>
So the probability of getting 2 heads on three tosses is 3/8.<br>
Note for this simple example it is easy to see that there are three ways of getting 2 heads, by seeing that the one tail can come up on any one of the three tosses.<br>