Nous nous sommes brossés. Or alternatively, for an all female group: Nous nous sommes brossées
-- Chris (not a native speaker).
Hi Deborah. This caught me out too. But I think the Kwiz answer (full answer: "Nous nous sommes brossé les cheveux") is correct. According to e.g. http://la-conjugaison.nouvelobs.com/regles/orthographe/l-accord-du-participe-passe-des-verbes-pronominaux-188.php there is no agreement of the past participle with the subject when a direct object follows. They give the example of "Ils se sont lavé les mains". This would seem to apply here also.
Perhaps there is a lesson on this that I haven't found. If not, it would be nice to have one.
ps. I read a recent article where it said that French school kids spend 80 hours on average learning the rules for past participle agreement!
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