Discussion
Three unbiased coins are tossed. What is the probability of getting at least 2 tails?
Answer: B
Three coins give \( 2^{3} = 8 \) equally likely outcomes. Those with at least two tails are
\[ \text{TTH},\ \text{THT},\ \text{HTT},\ \text{TTT} \]
\[ P = \frac{4}{8} = 0.5 \]
"At least two" takes in all three tails as well; counting only exactly two would give 0.375.
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