A coin is flipped 4 times. Let A be the event that we record an equal number of HEADS and TAILS.
A) Write down the event A by explicitly writing its elements between curly braces.
B) Evaluate P(A)
Here is your outcome space:
$\begin{array}{*{20}{c}}
H&H&H&H \\
H&H&H&T \\
H&H&T&H \\
H&H&T&T \\
H&T&H&H \\
H&T&H&T \\
H&T&T&H \\
H&T&T&T \\
T&H&H&H \\
T&H&H&T \\
T&H&T&H \\
T&H&T&T \\
T&T&H&H \\
T&T&H&T \\
T&T&T&H \\
T&T&T&T
\end{array}$
Now you tell us the answers.