Volume Issue(2020) The Nepal Journal of Mathematical Sciences is now available on NepJOLhttps://www.nepjol.info/index.php/njmathsci/index 1. A Novel Prey-Predator Quadratic Harvesting Model … Prabir Panja & Dipak K. Jana1-222. Existence and Extremal Solution of Boundary Value … B.D. Karande & Pravin M. More23-323. A New Two – Parameter Lindley Distribution… Rama Shanker & Umme H. Rahman33-424. 3n+1 Problem and its Dynamics… Bishnu Hari Subedi & Ajaya Singh43-505. An Alternative Proof of Rubin’s Lemma… Santosh Ghimire51-546. Determinants of Households’ Adaptation Practices … Ananta Dhungana, Vikash KC, Purna Khand & Surya Dhungana55-647. On The Degree of Approximation of a Function by … Suresh K.Sahani , Vishnu N. Mishra & Narayan P. Pahari 65-708. Basic Operations on Vedic Mathematics: A Study on Special … Krishna Kanta Parajuli71-769. A Note on Natural Transformation of Exton’s Triple … Harsh V. Harsh, Puneet K. Sharma & Shabana Khan77-84