How many ways are there of arranging the sixteen black or white pieces of a standard international chess set on the first two rows of the board?

Given that each pawn is identical and each rook, knight and bishop is identical to its pair.

• total way to arrange 16 pieces on board on 1st two row are = 16P16=16!
  As all pawn , rook m knight , bishop are identical so = 16!/8!2!2!2!=64864800
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