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There are 26 students in the class, among them two friends — Andrey and Sergey. Students are randomly divided into 2 equal groups. Find the probability that Andrey and Sergey will be in the same group.

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Let one of the friends be in some group. Together with him, 12 people from the 25 remaining classmates will be in the group. The probability that the second friend will be among these 12 people is 12 : 25 = 0.48.

Answer: 0.48.

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