by Pramila Kharel | Gunakhar Pokharel | Phanindra Prasad Bhandari | Shree Ram Khadka | Central Department of Mathematics, Tribhuvan University, Kirtipur, Nepal | Kathmandu Model Secondary School, Lalitpur, Nepal | Department of Science and Humanities, Khwopa Engineering College, Bhaktapur,Nepal | Central Department of Mathematics, Tribhuvan University, Kirtipur, Nepal
