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Helping The others Realize The Advantages Of Hoàn Nguyên Vị
antonioj308ckr4
10 hours ago
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Giải: Mỗi cách xếp 10 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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