can I buy a pack of 10 tickets t+ in terminal 1 of Airport Charles de Gaulle and can do I pay with them to Bus 351 driver?Thanks
Yes you can purchase a booklet of ten Paris Metro/bus tickets (ticket t+) from the ticket vending machines at the CDG Roissypole train station (which serves CDG Terminal 1) and use them for Bus 351.
When entering the bus, find the ticket validation machine just behind the driver. Validate (insert then take back) as many tickets into the ticket validation machine as you need for your ride to your destination (I'd suggest showing your tickets to the driver and ask "[say your destination], How many?"). It should be 3 tickets into Paris I believe.