Mathematics, 16.06.2021 14:00 caitybugking

Một nhóm học sinh gồm 6 bạn nam và 4 bạn nữ đứng ngẫu nhiên thành 1 hàng, xác suất để có đúng 2 bạn nữ trong 4 bạn nữ đứng cạnh nhau.

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Một nhóm học sinh gồm 6 bạn nam và 4 bạn nữ đứng ngẫu nhiên thành 1 hàng, xác suất để có đúng 2 bạn...

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