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Mathematics, 03.08.2021 15:50 coco8560

Từ 8 quả bóng đỏ, 9 quả bóng vàng, 4 quả bóng xanh. Có bao nhiêu cách chọn 6 quả bóng a) chỉ có đúng 1 màu
b) số bóng vàng bằng quả xanh và luôn đủ 3 màu

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Từ 8 quả bóng đỏ, 9 quả bóng vàng, 4 quả bóng xanh. Có bao nhiêu cách chọn 6 quả bóng a) chỉ có đún...

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