Tính số cách chia 10 đồ vật vào 4 cái hộp
a) Nếu 10 đồ vật đó giống nhau hoàn toàn
b) Nếu 10 đồ vật đó khác nhau, nhưng thứ tự xếp đồ trong hộp ko quan trọng
c) Nếu 10 món đồ đó khác nhau, và được chia vào hộp sao cho lần lượt mỗi hộp chứa 3,3,2,2 món đồ. Vị trí trong đó cũng được tính đến

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