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Mai Anh Trần
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2024-05-04 00:08:37
1/3 ; 3/4 ; 440000/3
2024-05-03 23:46:02
Gọi số cần tìm có dạng là abcd ( a khác b khác c khác d)
a có 7 cách chọn
b có 6 cách
c có 5 cách
d có 4 cách
=> vậy có 7.6.5.4=840 số