PP-T2-PS116

[max999]

A certain manufacturer of cake, muffin, and bread mixes has 100 buyers, of whom 50 purchase cake mix, 40 purchase muffin mix, and 20 purchase both cake mix and muffin mix. If a buyer is to be selected at random from the 100 buyers, what is the probability that the buyer selected will be one who purchases neither cake mix nor muffin mix?

[pigeon]

Is the answer 0.3?

[max999]

Is the answer 0.3?

我的版本沒有答案
我想應該是吧!
因為我也算0.3
謝謝pigeon