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 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
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
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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