英语数学概率题Two cards are drawn simultaneously from a standard pack of 52 playing cards.Use a tree diagram to find the probablity that:(A)Both are hearts.(B)Just one is a heart
问题描述：
英语数学概率题
Two cards are drawn simultaneously from a standard pack of 52 playing cards.Use a tree diagram to find the probablity that:
(A)Both are hearts.
(B)Just one is a heart
答
A) Heart Diamond Spade Club然后每一项下边再把这四个都写出来然后总共是4x4=16项n=16其中两个都是heart的只有一组所以m=1概率=1/16B) Heart Diamond Spade Club然后每一项下边再把这四个都写出来然后总共是4x4=16...