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A coin is tossed twice. What is the probability of tossing \(2\) heads?
\begin{array}{|l|l|l|}
\hline & \text { Heads } & \text { Tails } \\
\hline \text { Heads } & (\mathrm{H}, \mathrm{H}) & (\mathrm{H}, \mathrm{T}) \\
\hline \text { Tails } & (\mathrm{T}, \mathrm{H}) & (\mathrm{T}, \mathrm{T}) \\
\hline
\end{array}
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