Two unbiased coin are tossed .What is the probability of getting at most one head?
A
$$\frac{{1}}{{4}}$$
B
2
C
$$\frac{{3}}{{4}}$$
D
1
Correct Answer: $$\frac{{3}}{{4}}$$
Sample space (All [possible outcomes)S=(HH, HT, TH, TT)Event(required outcomes) = (TT, HT, TH)
$$\eqalign{ & {\text{p}}\left( {\text{E}} \right) = \frac{{{\text{n}}\left( {\text{E}} \right)}}{{{\text{n}}\left( {\text{S}} \right)}} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{3}{4} \cr} $$
