Why Bihar is backward?

The Indian state of Bihar has a low literacy rate, of around 52 percent. This translates to a rate of around 59.7 percent for males and 33.1 percent for females. The sex ratio is around 108.8, that is, for every 100 females, there are 108.8 males - in a population of nearly 83 million. This is the third largest state population in the whole of India.