A fair coin is tossed 3 times in a row what is the probability that heads appears exactly 2 times

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A fair coin is tossed 3 times in a row what is the probability that heads appears exactly 2 times

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Well the answer is 3/8
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What's the probability that heads appears on only the last toss
Let H represent an outcome of heads and T represent an outcome of Tails . For three tosses of the coin all the possible outcomes are: . H-H-H T-H-H H-T-H H-H-T T-H-T T-T-H H-T-T T-T-T . These eight possible outcomes are the sample space. . To find the probability of tossing heads exactly twice look down the sample space list and find any outcome that has exactly two H's. The possibilities are T-H-H, H-T-H, and H-H-T. This means that three of the eight possible outcomes contain exactly two heads. Therefore, the probability of throwing exactly two heads in three tosses of the coin is 3 out of 8, or 3/8

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