You need to get to Charles de Gaulle Airport by metro and then by RER B: can you buy just a ticket for RER and use it for the metro, and then take the RER; or do you need to first use a T+ ticket for 2.15 in the metro and then the RER ticket?
Buy a ticket for €10.5. With it, you will enter the metro and transfer to the RER B to the airport.
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