The probability that a person will trave...

The probability that a person will travel by plane is `3/5` and that he will travel by train is `1/4`. What is the probability that he (she) will travel by plane or train?

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Let A be the event that the person travel by plane
`P(A) = 3/5`
Let B be the event that the person travel by train
`P(B) = 1/4`
...

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