(a1+a3+a9)/(a2+a4+a10)=?
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(a1+a3+a9)/(a2+a4+a10)=?(a1+a3+a9)/(a2+a4+a10)=?(a1+a3+a9)/(a2+a4+a10)=?a1634634(a1+a3+a9)/(a2+a4+a1
(a1+a3+a9)/(a2+a4+a10)=?
(a1+a3+a9)/(a2+a4+a10)=?
(a1+a3+a9)/(a2+a4+a10)=?
a1634634
(a1+a3+a9)/(a2+a4+a10)
=[a1+ (a1+2d)+(a1+8d)] / [(a1+d)+(a1+3d)+(a1+9d)]
=[3a1+10d]/[3a1+13d]
=[13d]/[16d]
=13/16
(a1+a3+a9)/(a2+a4+a10)=?
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