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Two unbiased coin are tossed .What is the probability of getting at most one head?

Two unbiased coin are tossed .What is the probability of getting at most one head? Correct Answer $$\frac{{3}}{{4}}$$

Sample space (All [possible outcomes)S=(HH, HT, TH, TT)
Event(required outcomes) = (TT, HT, TH)
$$\eqalign{ & {\text{p}}\left( {\text{E}} \right) = \frac{{{\text{n}}\left( {\text{E}} \right)}}{{{\text{n}}\left( {\text{S}} \right)}} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{3}{4} \cr} $$

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