The Hashemite Kingdom of Jordan Yarmouk University Jordan Journal of Mathematics and Statistics An International Research Journal Funded by the Scientific Research Support Fund Volume 6, No. 2, June 2013, Sha’aban 1434 H ISSN(Print) 2075 - 7905 ISSN(Electronic) 2227- 5487 Jordan Journal of Mathematics and Statistics An International Research Journal Volume 6, No. 2, June 2013, Sha’aban 1434 H Jordan Journal of Mathematics and Statistics (JJMS): An International Peer-Reviewed Research Journal issued quarterly by the Deanship of Research and Graduate Studies, Yarmouk University, Irbid, Jordan, and funded by the support of Scientific Research Support Fund, Ministry of Higher Education and Scientific Research, Amman, Jordan. EDITOR-IN-CHIEF: Abdulla M. Al-Jarrah Department of Mathematics, Yarmouk University, Irbid, Jordan. Current Address: Dean of Research and Graduate Studies, Yarmouk University, Irbid, Jordan. E-mail:
[email protected] EDITORIAL SECRETARY: Enas Yousef, Deanship of Research and Graduate Studies, Yarmouk University. E-mail:
[email protected] EDITORIAL BOARD: Mashhoor A. Al-Refai Nabil T. Shawagfeh Department of Mathematics, Yarmouk University, Department of Mathematics, University of Jordan, Irbid, Jordan. Amman, Jordan. Current Address: Vice President, Princess Current Address: President, Al-Balqa Applied Sumaya University for Technology, Amman, University, Al-Salt, Jordan. Jordan. E-mail:
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[email protected] Mufid M. Azzam Abdalah M. Rababah Department of Mathematics, University of Jordan, Department of Mathematics, JUST, Irbid, Jordan. Amman, Jordan. E-mail:
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[email protected] Basem S. Masaedeh Ahmad A. Al-Rhayyel Department of Mathematics, Mutah University, Department of Mathematics, Yarmouk University, Karak, Jordan.