What is a woman's requirement to say Bircat Hamazon with a Zimun of women?
What is a women's requirement to say Bircat Hamazon with a Zimun of men?
The Shulchan Aruch in Orach Chaim Siman 199 Paragraph 7 says:
שולחן ערוך אורח חיים סימן קצט:ז
Women can do a Zimun alone. It is a רשות (optional). But if they are with three men, then the women are obligated (with the men), and a man would lead.
The Beiur Halacha quoted below states that according to the GR”A even a group of women eating without men have a חוב (obligation) to create a Zimun. However, he notes this is not how the world is accustomed.
ביאור הלכה סימן קצט ד"ה נשים מזמנות