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The formula for the sum would be "Sn=(a(1-r^n)/(1-r)" since the common ratio ( r )=3, number of terms (n)=17 and the first term ( a ) = 6 , we substitute it to the formula then we will get the sum (Sn)=-387420486. Solution: Sn=(6(1+3^17)/(1-3)=(-774840972)/(-2)=-387420486
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