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Authors: |
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Mohammed Ibrahim Dibal - Department of General Studies, School of General and Remedial Studies, Federal Polytechnic Damaturu, Yobe State. Postal code: +234. Nigeria
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Yeak Su Hoe - Department of Mathematical Science, Faculty of Science, Universiti Teknologi Malaysia 81310 Skudai, Johor Bahru. Postal code: +60. Malaysia
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