The table above shows the number of residents in each of two age groups who support the use of each type of funding for a city initiative. What is the probability that a person randomly selected from among the 250 residents polled is younger than 40, or supports a type of funding that incudes a tax, or both?
8/25
12/25
3/5
4/5
韦恩图
或P(AnB)=P(A)+P(B)-P(AB)=P(A)+P(只属于B不属于A)
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