In Gen.6:19-20 there are to be 2 of each kind. In 7:2-3 there
are to be 7 pairs of clean animals (an anachronism before the Levitical
code). These accounts appear to come from different sources (note also,
e.g., the use of "God" in the 1st & "LORD" in the 2d.) There is no
justification for artificially "harmonizing" the numbers & no need to if
one recognizes that this isn't historical reporting. Respect for the
authority of Scripture means allowing accounts to speak for themselves
before we try to discern the underlying unity.
George Murphy