a bag consists of 50 balls. 32 of the balls are red and the rest are blue. it is also known that 30 out of the 32 red balls are made of plastic and the rest are made of cane. the blue balls are either made of plastic or cane.if instead, two balls are taken at random from the bag,find the probability that both balls are made of cane
热心网友
一个包里装了50个球,其中32个是红的,其余的是蓝的.32个红的中有30个是塑料做的,其余的是由藤做的.蓝球是由塑料或藤做的.随意从袋子里拿两个球出来,请计算出两个球都是藤做的可能性.题目差不多是这样,做就不会了,真不好意思.