L = 1.3.5+3.5.7+5.7.9+....+95.97.99
8L = 1.3.5.8 + 3.5.7.8 + 5.7.9.8 +....+ 95.97.99.8
8L = 1.3.5.(1+7)+3.5.7.(9−1)+5.7.9.(11−3)+....+95.97.99.(101−93)
8L = 1 .3.5+1.3.5.7−1.3.5.7+3.5.7.9−3.5.7.9+5.7.9.11+...−93.95.97.99+95.97.99.101
8L = 1.3.5+95.97.99.101
L = (1.3.5+95.97.99.101)/8
L = 11517600