Question

What is the probability of tossing three coins and having exactly one of them show tails?

Answer 1

h h h
h h t
h t h
t h h
h t t
t h t
t t h
t t t

those are the eight equally likely outcomes

Answer 2

of those 8 outcomes, 3 have exactly one tail
h h t
h t h
t h h
so your answer is \(\frac{3}{8}\)