Let me help you analyze it from the perspective of real life! Three people, only men and women (except shemale, hehe), that is to say, only two men and one woman, two women and one man, three men and three women. Four situations. (It's easy to understand, right) These four situations are of the same sex, so the possibility is 1 (that is, 100%, but the standard writing must be 1).

Answer:

Solution: From the meaning of the question, there are only four possibilities for three sexes: 1 three men. Three women. 3 Two men and one woman. Four women and one man.

Among the four possibilities, P (same-sex couple) =4/4= 1.

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