Upvote:1
As written in the official website
Valid for 1, 2, 3 or 5 consecutive days, the pass allows you to travel anywhere in Paris (zones 1 to 3) or in Paris and the Γle-de-France region (all zones, including airport connections, Orlyval, Disneyland Paris and ChΓ’teau de Versailles).
So, yes, you can take the RER-B from the airport to Paris.