|[http://www.ncert.nic.in/ncerts/textbook/textbook.htm?jemh1=1-14 NCERT Textbook Class - X - Mathematics - Chapter - 1 - Real Numbers] | |[http://www.ncert.nic.in/ncerts/textbook/textbook.htm?jemh1=1-14 NCERT Textbook Class - X - Mathematics - Chapter - 1 - Real Numbers] |