1Department of Mathematics, Lekshmipuram College of Arts and Science, Neyyoor, Kanyakumari, Tamil Nadu-629 802, India.2Department of Mathematics, Pionneer Kumaraswami College of Arts and Science, Nagercoil, Tamil Nadu-629 003, India.3Research Scholar, Pionneer Kumaraswami College of Arts and Science,vetturinimadam, Kanyakumari, Tamil Nadu-629 003, India.(Affiliated to Manonmaniam Sundaranar University, Tirunelvelli).
* Corresponding Author: M. Sankari. Email: sankarisaravanan1968@gmail.com