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Mathematics, 25.10.2021 15:20 jwyapo4
Có 4hs gồm 2 nam và 2 nữ đc xếp vào 2 dãy bàn đôis diện nhau
a hỏi có bao nhiêu cách xếp
b hỏi có bao nhiêu cách xếp mà nam nữ ngồi đói diện nhau
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Có 4hs gồm 2 nam và 2 nữ đc xếp vào 2 dãy bàn đôis diện nhau
a hỏi có bao nhiêu cách xếp
b...
b...
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