“I never teach my pupils; I only attempt to provide the conditions in which they can learn.” ~ ALBERT EINSTEIN
掷5枚硬币，求以下的概率：
a. 掷出五个“正面“b. 掷出至少一个“反面” c. 掷出两个“正面”及三个“反面”d. 掷出四个“正面”及一个“反面”
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