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[" (1) Find the sum of Mrst "22" terms o...

[" (1) Find the sum of Mrst "22" terms of an AP in which "d=7" and "22" nd term is "149" ."],[" (8) Find the sum of first "51" terms of an AP whose second and third terms are "14" and "18],[" respectively."],[" 9.If the sum of first "7" terms of an "/_D" is "40" end the "]

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Find the sum of first 51 terms of an AP whose second and third term are 14 and 18 respectively.