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Mary is playing cards and needs two hearts to win the hand. She draws a heart from the deck and quickly puts it in her

Mary is playing cards and needs two hearts to win the hand. She draws a heart from the deck and quickly puts it in her hand. With trepidation, she draws another card from the deck and is elated to find it is another heart. The best equation to use in order to calculate the probability of these successive, dependent events is

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