Question

Heeeeelp please An arithmetic series has ay = 3 and d= - 3. Find S20-

Answer 1

The first term is 3 and the common difference is negative 3. Then the sum of the first 20 terms will be negative 510.

What is a series?

A series is a sum of sequence terms. That is, it is a list of numbers with adding operations between them.

The first term (a₁) = 3 and the common difference (d) = -3. Then the sum of the first 20 terms will be

Sₓ = (x/2) [2a₁ + (x - 1)d]

Then we have

S₂₀ = (20/2) [2 × 3 + (20 - 1)-3]

S₂₀ = 10 [6 + (19)(-3)]

S₂₀ = 10 [6 - 57]

S₂₀ = 10 [51]

S₂₀ = -510

More about the series link is given below.

brainly.com/question/10813422

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