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co bao nhieu so khac nhau

a,trong các từ sau . từ nào có 3 chữ n

1,ban                      2, san                         3,lan                           4,tan 

 b, có 1 cô gái khóc bên hồ nước . hỏi cô ấy tên j

c,88888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888886888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888898888888888888888888888888888888888888888888888888888888888.                     tìm hai số khác số 8 trong hình trên