This will sound as a super stupid question, but I just read in the Molecular biology of the gene book (7th edition, Watson, Baker, Bell and al.) that one mistake occurs in 10 million nucleotides added during the replication of DNA.
However, I read in the Campbell's biology book (11th edition) that it is one mistake in 10 billion nucleotides added.
I tried to google it and kept finding these two numbers... probably because people use the same books as I do as sources. So, my question is the following: which book is right about DNA replication precision?
Thanks for your help and sorry if my question isn't very interesting.