7ce0adc7155c63a5e2b-73cd 201607260603 ijaas ch.ta.yeh@gmail.com WEB-FORM International Journal of ADVANCED AND APPLIED SCIENCES Int. j. adv. appl. sci. 2313626X 23133724 7 2016 7 2016 3 7 Department of Mathematics, Abdul Wali Khan, University Mardan, Khyber Pakhtunkhwa, Pakistan Muhammad Altaf Khan Ebenezer Bonyah Department of Mathematics and Statistics, Kumasi Polytechnic, P. O. Box 854, Kumasi, Ghana Shujaat Ali Department of Mathematics, Islamia College University, Peshawar, Khyber Pakhtunkhwa, Pakistan Saeed Islam Department of Mathematics, Abdul Wali Khan, University Mardan, Khyber Pakhtunkhwa, Pakistan Saima Naz Khan Department of Physics, Abdul Wali Khan University Mardan, Khyber Pakhtunkhwa, Pakistan 7 2016 7 2016 46 53 10.21833/ijaas.2016.07.008 http://www.science-gate.com/IJAAS/V3I7/Khan.html