contradiction of jewish scriptures

Why is Stephen's statement, "And Joseph sent and called Jacob his father and all his relatives, seventy-five souls" (Acts 7:14), considered a contradiction of the Jewish Scriptures? Let's find out. Answer: There are three citations from the Jewish Scriptures with which we are concerned here: "All the souls of the house of Jacob that came into Egypt were seventy" (Genesis 46:27); "And all the souls that came out of the loins of Jacob were seventy souls" (Exodus 1:5); "Your fathers went down int