\(=\frac{2.4.3.5.4.6.5.7....39.41}{3.4.5....40.3.4.5....40}=\frac{\left(2.3.4.....39\right).\left(4.5.6.....41\right)}{\left(3.4.5......40\right).\left(3.4.5......40\right)}=\frac{2.3.4.....39}{3.4.5....40}.\frac{4.5.6.....41}{3.4.5.....40}=\frac{2}{40}.\frac{41}{3}=\frac{41}{60}\)