1*3+3*5+5*7+...+99*101
=(2-1)*(2+1)+(4-1)*(4+1)+...(100-1)*(100+1)
=(2*2+4*4+...100*100)-1*50
=4*(1*1+2*2+...50*50)-50
=4*(50+1)*50*(100+1)/6-50
=171650