3 years ago

Evaluate the arithmetic series. Please help me!!!

Mathematics

1 answer:

saw5 [17]3 years ago

7 0

Answer:

Step-by-step explanation:

∑1 to 18 (5n-4)

a1=5×1-4=1

a2=5×2-4=6

a18=5×18-4=86

n=18

$S_{n}=\frac{n}{2} (a1+an)\\S_{18}=\frac{18}{2} (1+86)=9 \times 87=783$

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