While in this case it could be more due to ignorance than denial, the study found that nearly one third of American adults, 31 percent, believed that fewer than two million Jews were killed, and for millennials the number was 41 percent.
Although in the same article it says:
there were 17 million victims of the Holocaust, with the largest single group targeted being the roughly 6 million Jews who perished.
http://www.dw.com/en/us-adults-rapidly- ... a-43364480
Where the hell does this number comes from?