Two coins

Two coins are tossed simultaneously. What is the probability of getting
(i) At least one head?
(ii) At most one tail?
(iii) A head and a tail?

Correct answer:

p₁ =  0.75
p₂ =  0.75
p₃ =  0.5

Step-by-step explanation:

$$\begin{gathered} p_0=\frac{1}{2}=0.5 \\ HH,HT,TT,TH \\ OK:HH,HT,TH \\ {p}_1=\frac{1+1+1}{4}=\frac{3}{4}=0.75 \end{gathered}$$

$$\begin{gathered} HH,HT,TH \\ {p}_2=\frac{3}{4}=0.75 \end{gathered}$$

$$\begin{gathered} HT,TH \\ {p}_3=\frac{2}{4}=\frac{1}{2}=0.5 \end{gathered}$$

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