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Question Number 127360 by bemath last updated on 29/Dec/20
Answered by liberty last updated on 29/Dec/20
let:a−7b,a−6b,a−5b,...,a+5b,a+6b,a+7bisAPgivencondition→{3a−18b=−60;a−6b=−20(thefirst3terms)3a+18b=84;a+6b=28(thelast3terms)weget{a=4b=4.wewanttocomputethesumofthemiddle3terms⇒T7+T8+T9=(a−b)+a+(a+b)=3a=3×4=12
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