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In some regions Hindi is used. In the cities you will also find people knowing English. Most of the states have their own regional language though. Bengali is spoken in West Bengal, Odia also spelled Oriya in Odisha and Nepali is used in Sikkim.
The best way to address anyone in Eastern India especially in the Bengal region is 'Namoshkar' - loosely translated to 'Hello' and don't forgot to thank - 'Dhannobaad'
