SA
Sole Abdulloev
a183=a1+182*d=a1+4*d+178*d=a5+178*d; a183/a5=(a5+178*d)/a5 = 1+178*d/a5=17; d/a5=16/178=8/89
a25=a1+24*d=a5+20*d; a47=a1+46*d=a5+42*d; a25/a47=(a5+20*d)/(a5+42*d)=(1+20*d/a5)/(1+42*d/a5)=(1+20*8/89)/(1+42*8/89)=(89+160)/(89+336)=249/425