Discussion
If four coins are tossed, the probability of getting two heads and two tails is -.
Answer: A
Four coins give \( 2^{4} = 16 \) outcomes. Choose which two of the four show heads:
\[ {}^{4}C_{2} = 6 \]
\[ P = \frac{6}{16} = \frac{3}{8} \]
The six arrangements are HHTT, HTHT, HTTH, THHT, THTH and TTHH.
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