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Có 3 hộp bi . Hộp 1 có 7 bi đỏ 8 bi trắng .Hộp 2 có 2 bi đỏ 6 bi trắng. Hộp 3 có 7 bi đỏ 2 bi trắng .Lấy từ mỗi hộp 1 bi tìm xã suất? a. lấy được 3 bi đỏ
b. lấy được đúmh 1 bi đỏ
c. lấy được ít nhất 1 bi đỏ

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Có 3 hộp bi . Hộp 1 có 7 bi đỏ 8 bi trắng .Hộp 2 có 2 bi đỏ 6 bi trắng. Hộp 3 có 7 bi đỏ 2 bi trắng...
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