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The best Side of Hoàn Nguyên Vị
petery964tbi1
38 minutes ago
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Giải: Mỗi cách xếp ten bạn học sinh thành hàng dọc là một hoán vị của ten 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 one đến k. Lấy
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