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Câu 46:

Cho tập $A$ có $26$

Câu 46: Cho tập AAA có 262626 phần tử. Hỏi AAA có bao nhiêu tập con gồm 666 phần tử?

Thông tin câu hỏi

Câu 46:

Cho tập $A$ có $26$ phần tử. Hỏi $A$ có bao nhiêu tập con gồm $6$ phần tử?