Mathematics, 15.06.2021 18:50 phillswift2020
Có 5 bạn A;B;C;D;E .Hỏi có bao nhiêu cách xếp 5 bạn vào một ghế dài gồm 5 chỗ ngồi sao cho :
a) 5 bạn ngồi bất kì
b) C ngồi ở giữa.
c) Hai bạn A;E ngồi ở hai đầu bàn.
Answers: 1
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Có 5 bạn A;B;C;D;E .Hỏi có bao nhiêu cách xếp 5 bạn vào một ghế dài gồm 5 chỗ ngồi sao cho :
a) 5 b...
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