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Of 100 people, 75 have personal computers, 68 have washing machines, 85 have refrigerators and 80 have video recorders. How many people have the above four items at the same time?
Answer: 8%,

Solution: (75%+68%+85%+80%)-300%=8%

Explanation: Because when 75% of 100 people have a washing machine and 68% have a computer, the minimum probability of at least two people is 75%+68%- 100%, while at least three people have a washing machine and 68% have a washing machine.

-Quote the answer of "Nangong Qilao".

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