The total number of chairs in the eight rows of the conference hall is; 144 chairs.
What is the total number of chairs in the eight rows?
From the task content;
It follows that the first row contained 11 chairs and each successive row has 2 more chairs. It therefore follows from the sum of terms for an arithmetic progression that the eight rows contain;
Total number of chairs = (8/2) × (2(11) + 7(2))
S = 4 × 36 = 144.
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