In a random experiment, a symmetrical coin is thrown three times, find the probability that it will be heads exactly once?

For a more visual representation, we will write down all possible combinations of heads and tails when tossing a coin three times (O – heads, P – tails):

1) O, O, O,

2) P, P, P,

3) P, P, O (*),

4) P, O, P (*),

5) O, P, P (*),

6) P, O, O,

7) O, P, O,

8) O, O, R.

A total of 8 options came out. Of these, heads fall exactly once – 3 options. This means that the probability of getting heads once is 3/8 = 0.375.