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makvit [3.9K]
3 years ago
5

What is the value of the arithmetic series below?

Mathematics
2 answers:
MariettaO [177]3 years ago
4 0

Answer:

A

Step-by-step explanation:

E2020

RoseWind [281]3 years ago
3 0

Answer:

- 494

Step-by-step explanation:

Breaking down the summation into it;s component parts

= 4k - \frac{3}{2} k(k + 1) ← substitute k = 19

= (4 × 19 ) - 1.5 × (19 × 20)

= 76 - (1.5 × 380)

= 76 - 570

= 494

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