Thelengthsoftherungsofaladderdecreaseuniformlyby2cmfrombottom
totop.Thebottomrungis45cminlength.Thelengths(incm)ofthe1st,
2nd,3rd,...,8thrungfromthebottomtothetopare,respectively.Formthe
A.P.fromthegiveninformation.Findits9th,10thand11thterms.
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