1/1*3+1/3*5+1/5*7+.+1/49*51
=(1-1/3)*1/2+(1/3-1/5)*1/2+(1/5-1/7)*1/2+...+(1/49-1/51)*1/2
=(1-1/51)*1/2
=50/51*1/2
=25/51