A coin is tossed three times. Consider the event \( A \) : \( \math...

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A coin is tossed three times. Consider the event \( A \) :
\( \mathrm{P} \) 'exactly one head appear?. Then the number of

W elements in set \( A \)
(1) 5
(2) 3
(3) 4
(4) 9
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