1Department of Mathematics Payyanur College Payyanur-670327 Kerala, India.
2Core Group RCore Group Research Facility (CGRF) National Centre for Advanced Research in Discrete Mathematics (n-CARDMATH) Kalasalingam University Anand Nagar, Krishnankoil-626 190, India.esearch Facility (CGRF) National Centre for Advanced Research in Discrete Mathematics (n-CARDMATH) Kalasalingam University Anand Nagar, Krishnankoil-626 1
3Department of Mathematics Mary Matha Arts and Science College Mananthavady- 670645 Kerala, India,
4C R Rao Advanced Institute of Mathematics, Statistics and Computer Science Hyderabad Central university Campus Gachi Bowli, Hyderabad -500 046