Akhtar Hussain is a final year PhD student at Abdus Salam School of Mathematical Sciences conducted research under the well-known supervisor Prof. Dr. F. D Zaman (Abdus Salam School of Mathematical Sciences). Akhtar has published a number of articles in well-reputed journals and has also presented those articles in international conferences, where a number of advisors accepted the papers during the conference. The paper submitted here was also approved by Supervisor Prof. Dr. F.D Zaman.