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Mathematics, 04.08.2021 04:40 teddybear196510
Có bao nhiêu cách sắp xếp 5 bạn học sinh A, B,C, D,E ngồi vào một chiếc ghế dài sao cho:
a)C ngồi chính giữa
b)A và E ngồi ở 2 đầu ghế
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Có bao nhiêu cách sắp xếp 5 bạn học sinh A, B,C, D,E ngồi vào một chiếc ghế dài sao cho:
a)C ngồi c...
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