sum of first 10 terms of AP 185 and sum of its first 9 terms is 153 if common difference of AP is 3 find sum of its first 21 terms. plzz help me with ths
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aktKrKr4is5o5o5lskr5o5o6o5lekrsj4wi4wnranrsi595wi5 STM 8aklt6o4ismtsoqk5dlfLysypdykwo6dyl
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JhhjjvdggchdrjHLFJDHDDHHDFJ GJIOOOPOOOPKKKKKKKKKKKLKLLLLLLLLLLKKKKKK
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