4 years ago

Find the sum of the first 25 terms of the arithmetic sequence.

Mathematics

1 answer:

Marta_Voda [28]4 years ago

3 0

Answer:

Step-by-step explanation:

$\frac{n}{2}*(a+l)=\frac{25}{2}*(100+220)\\\\=\frac{25}{2}*320=\frac{25*320}{2}\\\\=25*160=4000$

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