Mathematics, 25.10.2021 02:30 fluffy37
Một hộp có 4 bi xanh, 4 bi đỏ, 5 bi vàng. có bao nhiêu cách chọn ra 4 bi có đủ 3 màu? có đúng 2 màu?
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Một hộp có 4 bi xanh, 4 bi đỏ, 5 bi vàng. có bao nhiêu cách chọn ra 4 bi có đủ 3 màu? có đúng 2 màu?...
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