This Bible contradiction is from the Skeptic's Annotated Bible.
Genesis 11:26 View context
And Terah lived seventy years, and begat Abram, Nahor, and Haran.
Genesis 12:4 View context
So Abram departed, as the LORD had spoken unto him; and Lot went with him: and Abram [was] seventy and five years old when he departed out of Haran.
Acts 7:2-4 View context
And he said, Men, brethren, and fathers, hearken; The God of glory appeared unto our father Abraham, when he was in Mesopotamia, before he dwelt in Charran,
And said unto him, Get thee out of thy country, and from thy kindred, and come into the land which I shall shew thee.
Then came he out of the land of the Chaldaeans, and dwelt in Charran: and from thence, when his father was dead, he removed him into this land, wherein ye now dwell.
Genesis 11:32 View context
And the days of Terah were two hundred and five years: and Terah died in Haran.