[1] Inst Business Management, Dept Math & Stat, Karachi, Pakistan
[2] King Khalid Univ, Dept Math, Coll Sci, Abha 61413, Saudi Arabia
[3] Ton Duc Thang Univ, Math & Its Applicat Life Sci Res Grp, Ho Chi Minh City 72915, Vietnam
[4] Ton Duc Thang Univ, Fac Math & Stat, Ho Chi Minh City 72915, Vietnam
[5] Gomal Univ DI Khan, Dept Math, Khyber Pakhtunkhwa 29050, Pakistan