As announced by  Apple  it has sold three million iPads in three days 

..As a result of the launch of the iPad mini and fourth-generation iPad.

The company has not mention how many of those sales were actually the  iPad mini, versus the 4th generation iPad and iPad 2.  The company has stopped selling the 3rd generation iPad leading up to the new models’ release.

CEO Tim Cook said in a statement, 

“Customers around the world love the new iPad mini and fourth generation iPad,”

"We set a new launch weekend record and practically sold out of iPad minis. We’re working hard to build more quickly to meet the incredible demand.”

Apple notes that the sales of the Wi-Fi-only models double the milestone of the third-generation iPad’s release, which featured 1.5 million Wi-Fi only iPad sales in its first weekend.