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What is the probability of getting two heads in two flips of a balanced coin?
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Since the probability of heads is $\frac{1}{2}$ for each flip and the two flips are not physically connected, we treat them as independent. The probability is
$\frac{1}{2} \cdot \frac{1}{2}=\frac{1}{4}$
by Diamond (55,883 points)

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