Each of the 30 students in a class is either male or female, and has blonde, brown, or red hair. If one student is to be randomly selected from the class, what is the probability that the student will either be female or have brown hair?

(1) The probability that the student will both be female and have brown hair is 0.1.

(2) The probability that the student will be female minus the probability that the student will have brown hair is 0.25.

Source: Jeff Sackmann's GMAT Extreme Challenge

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