59、A interrior decorator will paint the apartment , there are six colors of the painting the decorator can use:red, blue , green , yellow,white,and pink. how many choices the decorator can make with the white color included ever chice.
bigur解答: 说实话,题目真的看不懂什么意思。大体猜测一下,就是6种颜色可以和白色来混合,说有几种结果。那就是从6中颜色中,可以随便0-6种,有多少个取法 1+C(6,1)+C(6,2)+C(6,3)+C(6,4)+C(6,5)+C(6,6)= 64 这里,答案给的从6个里选,我觉得不应该从6个里选吧,如果从6个里面选话不一定包括白色,题目要求有白色,应该是从5个里选吧? 1+C51+C52+C53+C54+C55? |