Related Post: 4 N )+ 2 (- 5n 3 4 N 3n 2 5n 4n 2 5n 3 4n 2 5n 36 4n 2 5n 336 5 N 3 )= 4 N 2 1 * 4 2 * 5 N N 3 N 2 3n 4 5n 6 21 N 2 3n 4 5n 6 N/2-3n/4+5n/6=21 Class 8 Solutions