我们还没讲,所以下面的问题需要详解,谢谢!
.A bag contains 4 red hammers,10 blue hammers,and 6 yellow hammers.if three hammers are removed from the bag at random and no hammer is returned to the bag after removal,what is the probability that all three hammeres will be blue?
A.1/2
B.1/8
C.3/20
D.2/19
E.3/18
译文:
一个袋子里有四个红色的锤子,10个蓝色的锤子,和6个黄色的。如果从袋子里任意拿出三个锤子,且,没有锤子拿出去之后再被放回来。那么这三个锤子都是蓝色锤子的概率是多少?