Fellow gaffers,
This is what is happening with regards to MS saying XBO was the fastest selling console in november: If you average 900k across 9 days (from the 22th of nov until the end of nov), you'll get an average of 100k per day, right? In comparison, averaging the amount of PS4 sold in november (lets say it was 1.2 M) requires more days because it was released earlier. So from the 15th of november until the end = 15 days. 1,200,000 / 15 = 800k.
Hope it helps
Do we even know the number of PS4 sold yet?