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В классе 26 учащихся, среди них два друга — Сергей и Андрей. Учащихся случайным образом разбивают на 2 равные группы. Найдите вероятность того, что Сергей и Андрей окажутся в одной группе.

Объясните, прошу! :) Готовлюсь к ЕГЭ по математике... (((
спросил от в категории Математика

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