There were five original writing systems.
All current writing systems except Chinese were developed from ancient Egyptian/Sumerian writing systems.
Egyptian/Sumerian were Arabs, I guess. So, we probably can say Bangladesh did adopt the Arabic writing system, although not from modern Arabic writing system.
All current writing systems except Chinese were developed from ancient Egyptian/Sumerian writing systems.
Egyptian/Sumerian were Arabs, I guess. So, we probably can say Bangladesh did adopt the Arabic writing system, although not from modern Arabic writing system.