Which of the following is NOT true about Gotras?

Members of the same Gotras could marry outside the village.

One Brahmanical practice, evident from c. 1000 BCE onwards, was to classify people (especially Brahmanas) in terms of gotras. Each gotra was named after a Vedic seer, and all those who belonged to the same gotra were regarded as his descendants. Two rules about gotra were particularly important: women were expected to give up their father’s gotra and adopt that of their husband on marriage and members of the same gotra could not marry.