A class has 15 male students and 10 female ones. The teacher randomly calls 4 students to solve the exercise. Calculate the probability that 4 students called are both male and female. (pass:numbers)
A class has 15 male students and 10 female ones. The teacher randomly told 4 students to solve the exercise. Calculate the probability that 4 students called are both male and female.(pass: 6 numbers)

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