1. Department of Mathematics, Federal College of Education , Iwo 232102, Osun State , Nigeria
2. Department of Mathematics and Statistics, Redeemer’s University , Ede 232101, Osun State , Nigeria
3. Department of Education, Vaal University of Technology , Vanderbijlpark 1911 , South Africa
4. Department of Mathematics, University of Ilorin , Ilorin 240003, Kwara State , Nigeria