1. School of General Education, DaLian Neusoft University of Information, DaLian 116023, China
2. Department of Mathematics, University of Okara, Okara, Pakistan
3. Department of Mathematics, COMSATS University Islamabad, Lahore Campus, Lahore, Pakistan
4. Department of Mathematics Education, Akenten Appiah Menka University of Skills Training and Entrepreneurial Development (Kumasi Campus), Ghana