The net Foreign Direct Investment (FDI) flowing into India reached a 21-month high in October reflecting the strengthening fundamentals of the economy, according to data compiled by the RBI.According to RBI data, the net FDI in India for October stood at $5.9 billion up from $1.55 billion in September. This is the third month in a row to show an increase in net FDI.Around four-fifths of the gross FDI flows into equity were invested in sectors such as manufacturing, retail, energy and financial services sector.