bioware said the mass effect series has sold 7 million copies. vgchartz has them at 5.6 million. so unless there has been 1.4 million digital downloads or we have it undertraked.
Halo MCC will sell 5+ million copies(including digital)
halo 5 will sell 10 million copies(including digital)
x1 will pass ps4 in USA, and UK.