SAT一道组合概率题求解答There are five cards marked 1,2,3,4,5 in a box. If the sum of two cards which are taken from those cards randomly (no replacement) is even. What is the probability that these two cards are both odd?A 1/4 B 3/4
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![SAT一道组合概率题求解答There are five cards marked 1,2,3,4,5 in a box. If the sum of two cards which are taken from those cards randomly (no replacement) is even. What is the probability that these two cards are both odd?A 1/4 B 3/4](/uploads/image/z/3930949-37-9.jpg?t=SAT%E4%B8%80%E9%81%93%E7%BB%84%E5%90%88%E6%A6%82%E7%8E%87%E9%A2%98%E6%B1%82%E8%A7%A3%E7%AD%94There+are+five+cards+marked+1%2C2%2C3%2C4%2C5+in+a+box.+If+the+sum+of+two+cards+which+are+taken+from+those+cards+randomly+%28no+replacement%29+is+even.+What+is+the+probability+that+these+two+cards+are+both+odd%3FA+1%2F4+++++B+3%2F4)
SAT一道组合概率题求解答There are five cards marked 1,2,3,4,5 in a box. If the sum of two cards which are taken from those cards randomly (no replacement) is even. What is the probability that these two cards are both odd?A 1/4 B 3/4
SAT一道组合概率题求解答
There are five cards marked 1,2,3,4,5 in a box. If the sum of two cards which are taken from those cards randomly (no replacement) is even. What is the probability that these two cards are both odd?
A 1/4 B 3/4 C 3/10 D 3/5 1/3
用Cmn或者Pmn的那个公式做,求完整步骤,谢谢
SAT一道组合概率题求解答There are five cards marked 1,2,3,4,5 in a box. If the sum of two cards which are taken from those cards randomly (no replacement) is even. What is the probability that these two cards are both odd?A 1/4 B 3/4
随机抽到两个奇数:C(2,3),随机抽到两张卡C(2,5),概率是:C(2,3)/C(2,5)=3/10