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Hoàn Nguyên Vị Things To Know Before You Buy
bobx975vdk2
198 days ago
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Giải: Mỗi cách xếp ten bạn học sinh thành hàng dọc là một hoán vị của 10 phần tử. Số tổ hợp chập k của n: Để đếm số tổ hợp chập k của n ta giả sử có k vị trí đánh số từ 1 đến k. Lấy
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