SAT2 概率題
SAT2 概率題
Three cards are drawn from an ordinary deck of 52 cards.Each card is replaced in the deck before the next card is drawn.What is the probability that at least one of the cards will be a spade?
求教思路和過程
Three cards are drawn from an ordinary deck of 52 cards.Each card is replaced in the deck before the next card is drawn.What is the probability that at least one of the cards will be a spade?
求教思路和過程
英語人氣:577 ℃時間:2020-05-21 12:37:49
優(yōu)質(zhì)解答
是不是37/64?答案是這個,請問具體是什么思路呢?要逆向思維,每次不是spade的幾率是3/4,三次就是開三次方,最后用1減下就是答案了
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