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I got 930

Yess I messed up

for each of the end sections
\[\sum_{i=4}^{23}i\]
for te middle section
\[\sum_{i=10}^{29}i\]

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do you know the general form of the sum of an arithmetic sequence nicolenova

yeah

do you see where the sums come from?

i don't really get the formulas

wait there isn't 10 rows, there's 20, and the first has 10 seats

10+11+12+13+14+15+16+17>75

k let me know if you get the same answer as me, I have 930 total seats

I just solved the last row first...heheheh LOL

good I'm glad it came out the same

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