Question

Three coins are tossed. Find the probability that no more than one coin lands heads up.

Answer 1

no more than one means no head or one head
there are 8 possibilities, and since 8 is a relatively small number we can write them all down:

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

of these 8 exactly 4 have no head or one head
your answer is \(\frac{4}{8}=\frac{1}{2}\)