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The Fact About Hoàn Nguyên Vị That No One Is Suggesting
friedensreichw975tcl2
180 days ago
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Giải: Mỗi cách xếp 10 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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